Add snapChat.js
Improve way to call snap chat from index.html
Change 'ng-if' by 'ng-show'.
And angular timeout in order to force digest cycle to force class apply.
*Add validation over history controller in order to avoid show 'history' for non 'gre' users.

If the user change the group from history page, they can be able to see the history inside Grockit 2.0 even for no GRE groups.
Fix Fraction highlight input.
*Add validation to numeric confirm choice.

*It sometimes bring me 'answerId' and sometimes 'id'.
*Remove old un used function 'answerHasExplanation'.
Fix review controller Indentation
Improve code readability for auth service.

*Some days ago I found a better way to validate this.
Merge pull request #114 from joanrm20/fallback-mode

Maua client Improvements