Add MIT license

Software is now under MIT license.
Refactor code

Clean up code, move things around, etc.
Add links to per question threads

Add a link in each row of question table to question thread.
Add forum function to flask app.
Add per question forum threads

Each question now has a thread in which users can post. The forums have
MathJax enabled.
On the Collabomo Page, it shows the time and user that posted last.