Added .travis.yml with secure credentials so it can run with the infopark repository.

* More details see http://about.travis-ci.org/docs/user/languages/ruby/
* Also added secret ENV variables for testing.
Added Tests for Ruby 2.0.
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.
Merge pull request #3 from apepper/travis

Added Travis Continues Integration