Update link to rdoc format

This commit updates the build status link/picture to rdoc format.
Add closing brace

This commit adds a closing brace to the image link in the README.rdoc
Add bundle install to travis

This commit adds the bundle install command to the travis configuration
so that our dependencies needed to run tests are installed.
Add ruby 2.0.0 to travis config

This commit adds ruby 2.0.0 to the travis configuration for testing.
Merge pull request #5 from endoze/change-to-rdoc-link

Change to rdoc link