Add very first .travis.yml.

More details see http://about.travis-ci.org/docs/user/languages/ruby/
Add secret ENV variables for testing.
Added Tests for Ruby 2.0.
Added credentials for travis, so it can run with the infopark repository.
Added travis batch to read-me.
Updated Readme, to have better link to docu of activeresource and stating support of ruby 2.0
Improved source of Gemfile.
fixed broken .travis.yml file.