Add Travis CI bits
Add Coveralls bits

The Code Climate README.md changes were already made too.
Provide default options
Remove JRuby and Rubyinius 1.8 support from the travis.yml.
Bump minor version due to new coveralls dependency
Add support for username and password as arguments
Avoid class variables and streamline credentials method
Merge pull request #2 from jvlcek/create_gem

Create gem