Initial Student Questions Commit

Changed the original functionality of the student submissions from
submitting a slide deck to simply submitting a question string. There
are a few bugs with this initial commit, but they should be easy to iron
out.
Implemented question input for anonymous questions, removed need for a slide deck to be open in order to do so
Comments

Added required commenting.
Re-enabled error checking

Modified the student submission notifications to use a custom popup form
instead of the current slide.
Modified Submission Message

Modified the message to the student for when the instructor closes the
question window.
Merge branch 'Student-Questions' into master_fresh