Add ruby 2.0.0 to travis config
Update gemfile source to https://rubygems.org (:rubygems is deprecated)
Merge pull request #36 from timcraft/travis-ruby2

Add ruby 2.0.0 to travis config
Merge pull request #37 from timcraft/gemfile-source

Update gemfile source to https://rubygems.org (:rubygems is deprecated)
Link readme header to docs