Hint Feature

Comment from Hsing:

"Wanting some feedback when they couldn't figure it out.  This is probably the hardest for quick fixes.  Wondering if its feasible to tag the levels the teachers will be testing, so if they press a hint button they can see which are correct and which are wrong.  Another idea, is pressing hint just pops up a definition of what each component is, e.g. def of a main arg, etc)."
