Whitespace and comment cleanup
Adding multi_json gem
Adds 'prompt' to multiple-choice choices
Adds "check" action for choices
Ignoring some cache files
Check-answer works from console.

This script takes a question ID and pops up an alert box indicating if it's correct or not. [#39917671] Iterate...
Re-enable functioning check-answer button

[#39917671] Removes CSS which hid the button, and makes it call our checkAnswer() function with a proper argument.
Custom prompts can be provided for multiple-choice

…and those are shown in the check-answer alert boxes. [#39917671]
Note for future refactoring...
Puts check-answer results in modal window

This gets rid of the alert boxes and finishes [#39917671].