Adds coveralls support

* Adds an encrypted COVERALLS_TOKEN to travis.yml and enabled cobertura and coveralls on after_success
* Adds license information to pom
* Ignores the MavenModelInspection error on the repoToken ${env.COVERALLS_TOKEN} (it's in the environment only in travis, see travis docs)
* Removed unused out-commented executions part of cobertura from pom
Adds sourceEncoding to pom

* It's good practice
* Coveralls plugin fails w/o it
Merge pull request #8 from oskopek/issue-007

Fixes #7: Set up code coverage and coveralls