Delete duplicated json files: they were move to build-tools but not delete from engine/schema
Merge pull request #270 from anserran/json-outputtype

Change output type to json
Updating travis CI configuration to use android-19 API. Resolve build problems in #274
Merge pull request #271 from angeldelblanco/delete-duplicate-json

Delete duplicated json files:
Merge pull request #275 from imartinezortiz/travis-android-fix

Updating travis CI configuration to solve build problems in #274
Added client id preference
Added convenience method make tracker creation platform dependent
Added convenience method to access release info
Added activation mechanism to tracker. Small refactor in sendBugReport
Added rudimentary implementation of Google Analytics