Merge pull request #216 from adamarla/master

Fixed issue with refreshing "Stabbed" questions
Merge pull request #217 from adamarla/master

fixed bug in availability of question check
Creating a new Doubts table for Ask a Question ...
Removed references to scanbot and changed it to PrepWell ...

The welcome mail to students also has a link taking them directly to
the AppStore.
Merge branch 'gredits'
Merge branch 'master' of github.com:abhinavc/web-application
Require an (uploaded) scan for every doubt
[receive_single_scan] -> processes DBT and SOLN too
Track whether or not a dount is worth adding as a question in the DB ...

.. the boolean is set at the discretion of the examiner clearing the doubt
Merge branch 'gredits'
syntax error causing app to crash - fixed