added work around for limits 2 error
Fixed again
Fix issue #33473, allow white space in expressions involving subtraction

13-2v or 13 -2v was being accepted, but 13 - 2v was not.
https://github.com/Khan/khan-exercises/issues/33473
Allow whitespace after negation and subtraction.

Add \\s* after all instances of [-\\u2212] in exercises and tested.
There is no reason for counting students wrong for variance in formatting
of this type, and it is not infrequent to see expressions as 5 - x in text.
var tag incorrectly terminated with a /span ending tag

This was causing errors on our local school server by
students with Macs using Safari.
Added boxes to completing the square exercises
Merge remote-tracking branch 'upstream/master'

Conflicts:
	exercises/limits_2.html
Merge branch 'master' of git://github.com/Khan/khan-exercises
Merge remote-tracking branch 'upstream/master'

Conflicts:
	exercises/limits_2.html
Update limits_2.html
Cleaned up answer area
Cleaned up answer area
Merge branch 'completeSquare' of https://github.com/Helpsypoo/khan-exercises into completeSquare
Caesar Cipher Exercises 1-4
Cipher Exercises 1-4: Updated text
Trying to get rid of old commit difference
revert old commit of limits_2 to current upstream version
Tweaks based on user feedback
Added IE10 CSS hack to properly format interactive slider
Cleaned up some tags, fixed Barchart display