diff --git a/Gemfile b/Gemfile
index 510335c..bbc7b1d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.3.1'
+ruby '2.5.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 41e249b..256b2e1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,204 +1,208 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.0.0)
-      actionpack (= 5.0.0)
-      nio4r (~> 1.2)
+    actioncable (5.0.7)
+      actionpack (= 5.0.7)
+      nio4r (>= 1.2, < 3.0)
       websocket-driver (~> 0.6.1)
-    actionmailer (5.0.0)
-      actionpack (= 5.0.0)
-      actionview (= 5.0.0)
-      activejob (= 5.0.0)
+    actionmailer (5.0.7)
+      actionpack (= 5.0.7)
+      actionview (= 5.0.7)
+      activejob (= 5.0.7)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.0.0)
-      actionview (= 5.0.0)
-      activesupport (= 5.0.0)
+    actionpack (5.0.7)
+      actionview (= 5.0.7)
+      activesupport (= 5.0.7)
       rack (~> 2.0)
       rack-test (~> 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.0.0)
-      activesupport (= 5.0.0)
+    actionview (5.0.7)
+      activesupport (= 5.0.7)
       builder (~> 3.1)
       erubis (~> 2.7.0)
       rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    activejob (5.0.0)
-      activesupport (= 5.0.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.0.7)
+      activesupport (= 5.0.7)
       globalid (>= 0.3.6)
-    activemodel (5.0.0)
-      activesupport (= 5.0.0)
-    activerecord (5.0.0)
-      activemodel (= 5.0.0)
-      activesupport (= 5.0.0)
+    activemodel (5.0.7)
+      activesupport (= 5.0.7)
+    activerecord (5.0.7)
+      activemodel (= 5.0.7)
+      activesupport (= 5.0.7)
       arel (~> 7.0)
-    activesupport (5.0.0)
+    activesupport (5.0.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    arel (7.0.0)
-    builder (3.2.2)
-    byebug (9.0.5)
-    coffee-rails (4.2.1)
+    arel (7.1.4)
+    bindex (0.5.0)
+    builder (3.2.3)
+    byebug (10.0.2)
+    coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
-      railties (>= 4.0.0, < 5.2.x)
+      railties (>= 4.0.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.2)
-    debug_inspector (0.0.2)
-    diff-lcs (1.2.5)
+    coffee-script-source (1.12.2)
+    concurrent-ruby (1.1.0)
+    crass (1.0.4)
+    diff-lcs (1.3)
     erubis (2.7.0)
     execjs (2.7.0)
-    faraday (0.9.2)
+    faraday (0.15.3)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.12)
-    globalid (0.3.6)
-      activesupport (>= 4.1.0)
-    hashie (3.4.4)
-    i18n (0.7.0)
-    jbuilder (2.5.0)
-      activesupport (>= 3.0.0, < 5.1)
-      multi_json (~> 1.2)
-    jquery-rails (4.1.1)
+    ffi (1.9.25)
+    globalid (0.4.1)
+      activesupport (>= 4.2.0)
+    hashie (3.5.7)
+    i18n (1.1.1)
+      concurrent-ruby (~> 1.0)
+    jbuilder (2.7.0)
+      activesupport (>= 4.2.0)
+      multi_json (>= 1.2)
+    jquery-rails (4.3.3)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    jwt (1.5.4)
+    jwt (2.1.0)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.0.3)
+    loofah (2.2.3)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    mail (2.6.4)
-      mime-types (>= 1.16, < 4)
-    method_source (0.8.2)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
-    mini_portile2 (2.1.0)
-    minitest (5.9.0)
-    multi_json (1.12.1)
-    multi_xml (0.5.5)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    method_source (0.9.0)
+    mini_mime (1.0.1)
+    mini_portile2 (2.3.0)
+    minitest (5.11.3)
+    multi_json (1.13.1)
+    multi_xml (0.6.0)
     multipart-post (2.0.0)
-    nio4r (1.2.1)
-    nokogiri (1.6.8)
-      mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
-    oauth2 (1.2.0)
-      faraday (>= 0.8, < 0.10)
-      jwt (~> 1.0)
+    nio4r (2.3.1)
+    nokogiri (1.8.5)
+      mini_portile2 (~> 2.3.0)
+    oauth2 (1.4.1)
+      faraday (>= 0.8, < 0.16.0)
+      jwt (>= 1.0, < 3.0)
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
-    omniauth (1.3.1)
-      hashie (>= 1.2, < 4)
-      rack (>= 1.0, < 3)
-    omniauth-github (1.1.2)
-      omniauth (~> 1.0)
-      omniauth-oauth2 (~> 1.1)
-    omniauth-oauth2 (1.4.0)
-      oauth2 (~> 1.0)
+    omniauth (1.8.1)
+      hashie (>= 3.4.6, < 3.6.0)
+      rack (>= 1.6.2, < 3)
+    omniauth-github (1.3.0)
+      omniauth (~> 1.5)
+      omniauth-oauth2 (>= 1.4.0, < 2.0)
+    omniauth-oauth2 (1.5.0)
+      oauth2 (~> 1.1)
       omniauth (~> 1.2)
-    pkg-config (1.1.7)
-    puma (3.4.0)
-    rack (2.0.1)
+    puma (3.12.0)
+    rack (2.0.5)
     rack-test (0.6.3)
       rack (>= 1.0)
-    rails (5.0.0)
-      actioncable (= 5.0.0)
-      actionmailer (= 5.0.0)
-      actionpack (= 5.0.0)
-      actionview (= 5.0.0)
-      activejob (= 5.0.0)
-      activemodel (= 5.0.0)
-      activerecord (= 5.0.0)
-      activesupport (= 5.0.0)
-      bundler (>= 1.3.0, < 2.0)
-      railties (= 5.0.0)
+    rails (5.0.7)
+      actioncable (= 5.0.7)
+      actionmailer (= 5.0.7)
+      actionpack (= 5.0.7)
+      actionview (= 5.0.7)
+      activejob (= 5.0.7)
+      activemodel (= 5.0.7)
+      activerecord (= 5.0.7)
+      activesupport (= 5.0.7)
+      bundler (>= 1.3.0)
+      railties (= 5.0.7)
       sprockets-rails (>= 2.0.0)
-    rails-controller-testing (0.1.1)
-      actionpack (~> 5.x)
-      actionview (~> 5.x)
+    rails-controller-testing (1.0.2)
+      actionpack (~> 5.x, >= 5.0.1)
+      actionview (~> 5.x, >= 5.0.1)
       activesupport (~> 5.x)
-    rails-dom-testing (2.0.1)
-      activesupport (>= 4.2.0, < 6.0)
-      nokogiri (~> 1.6.0)
-    rails-html-sanitizer (1.0.3)
-      loofah (~> 2.0)
-    railties (5.0.0)
-      actionpack (= 5.0.0)
-      activesupport (= 5.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
+    railties (5.0.7)
+      actionpack (= 5.0.7)
+      activesupport (= 5.0.7)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (11.2.2)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
-    rspec-core (3.5.0)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
+    rake (12.3.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-rails (3.5.0)
+      rspec-support (~> 3.8.0)
+    rspec-rails (3.8.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    sass (3.4.22)
-    sass-rails (5.0.5)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
+    sass (3.6.0)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.0.7)
       railties (>= 4.0.0, < 6)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    shoulda (3.5.0)
+    shoulda (3.6.0)
       shoulda-context (~> 1.0, >= 1.0.1)
-      shoulda-matchers (>= 1.4.1, < 3.0)
-    shoulda-context (1.2.1)
-    shoulda-matchers (2.8.0)
-      activesupport (>= 3.0.0)
-    spring (1.7.2)
-    spring-watcher-listen (2.0.0)
+      shoulda-matchers (~> 3.0)
+    shoulda-context (1.2.2)
+    shoulda-matchers (3.1.2)
+      activesupport (>= 4.0.0)
+    spring (2.0.2)
+      activesupport (>= 4.2)
+    spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
-      spring (~> 1.2)
-    sprockets (3.6.3)
+      spring (>= 1.2, < 3.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.1.1)
+    sprockets-rails (3.2.1)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sqlite3 (1.3.11)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tilt (2.0.5)
-    turbolinks (5.0.0)
-      turbolinks-source (~> 5)
-    turbolinks-source (5.0.0)
-    tzinfo (1.2.2)
+    sqlite3 (1.3.13)
+    thor (0.20.0)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    turbolinks (5.2.0)
+      turbolinks-source (~> 5.2)
+    turbolinks-source (5.2.0)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (3.0.0)
+    uglifier (4.1.19)
       execjs (>= 0.3.0, < 3)
-    web-console (3.3.1)
+    web-console (3.7.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
-      debug_inspector
+      bindex (>= 0.4.0)
       railties (>= 5.0)
-    websocket-driver (0.6.4)
+    websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.2)
+    websocket-extensions (0.1.3)
 
 PLATFORMS
   ruby
@@ -225,7 +229,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 2.3.1p112
+   ruby 2.5.1p57
 
 BUNDLED WITH
-   1.12.5
+   1.16.6