Generalize listenloop service to Analytic
merge from upstream
basic GA script
Merge pull request #7 from geetavin464/master

GA Utility
hide let track options.
hide custom topics directive.
Update alert message.
remove invalid double quotes from url.
Merge branch 'master' of https://github.com/joanrm20/maua
Hide left tracks
Fix tag resource style.
Improve question load validation.

*before we were validating by the tracks, but since the selected tracks is stored in local storage this doesn't works..
Instead of, right now the validation is by the questionId parameter which is more accurate.
Merge pull request #36 from joanrm20/master

Maua client new features