Fix specs and refactor

Goals:

* [x] Conventions checked by `rubocop`
* [x] Working unit `specs` w/o actual GoogleAPI calls
* [x] Integration `specs` with actual GoogleAPI calls
* [x] Clean repository (following the conventions of other open-source `gems`, like `FactoryGirl`, `Pry`, etc.)
* [x] Code Climate badge
* [x] TravisCI Integration
* [x] Gemnasium