Use travis for CI

Author: andrewvc

.travis.yml

@@ -1,4 +1,3 @@
----
 sudo: false
 language: ruby
 cache: bundler
@@ -7,4 +6,4 @@ rvm:
 script:
 - bundle exec rspec spec
 jdk: oraclejdk8
-before_install: []
+script: bundle exec rspec spec && bundle exec rspec spec --tag integration

README.md

@@ -95,4 +95,4 @@ Programming is not a required skill. Whatever you've seen about open source and
 
 It is more important to the community that you are able to contribute.
 
-For more information about contributing, see the [CONTRIBUTING](https://github.com/elastic/logstash/blob/master/CONTRIBUTING.md) file.
+For more information about contributing, see the [CONTRIBUTING](https://github.com/elastic/logstash/blob/master/CONTRIBUTING.md) file.