Release candidate

Changes:

• Travis CI configuration update
• Add "New Window" endpoint from W3C spec
• fix curl option array and w3c property (#105, @kadse)
• use response's capabilities (if returned) (#99, @GeraldWolfInvia)
• suppress "Transfer-Encoding: chunked" (#96, @mremi)
• tweak preg_quote() fix (refs #91, @stronk7)
• handle W3C in timeout abstraction (#88, @stof)
• fix W3C error strings (#87, @stof)
• add w3c property (#86, @stof)
• dependency injection (#73, @aik099)
• optional curl options, i.e., transient options (#53, @almostdaly)