Added sanitization and encoding to questions

- Fixes questions that had ? or other non-standard characters that
would not get inserted into the DB.
Added time checking for interactive question app

- Checks to see if the session is currently in progress and only allows
questions during that time, otherwise show a message.
Interactive question typo fix for variable retrieval
Interactive questions variable fix #2
Changes to instruction text for interactive questions
Fixed the relative references for js and css in questions/index.php
- Changed from ../../ to ../ to make the references work on dev URLs
On local-eats page, added an intro paragraph.
Added to git-pull.php some `git reset` and `git clean` commands
Merge branch 'master' into interactive-questions
Rewrote the return link on the questions page
- Removed "Return to session page: ". The return link now just states the session's title
- Made the return link relative, to point to the local program page
Merge branch 'interactive-questions-return-link' into program-ux