Khan/khan-exercises — pull request #12064 by Christi (2012-01-25 05:57:03+00:00)
Title: Random changes responding to #11230 and other issues

The following changes were made:

- changed visible clock to look like a real clock (functionality of snapPoints remains the same)
- moved information about the hand definition to hints since earlier time exercises don't define which hand is which and this should be something students should learn without the up front hints)
- changed hints to describe the movement of hands a little differently (talk about the hour hand traveling over the hour instead of proportionality which would be hard for young kids to understand)
- added messages for the cases where students switch hour and minute hands or if student doesn't account for hour hand traveling over the hour (but not if they do both)