Khan/khan-exercises — pull request #25122 by beneater (2012-06-29 00:33:02+00:00)
Title: Revert to Raphael 1.5.2

Reverts the following commits:

807fb8b Use the newest version of raphael
c347773 Fix rotation in derivative intuition
1b63c14 Fix bar scaling in creating bar charts
de985b8 Fix bugs with mean/median/stddev
009aa9f Fix drawing lines with interactive
765c97b Fix divisibility intuition
7d24651 Make protractor work
c6ead2b Fix weird fixed-point bug in telling time 2
2f15f1f Refactor movable points to make more sense
b2a5173 Remove a stray quote
3c7c513 Re-draw the bar instead of scaling
83483d9 Actually fix it by double-buffering
72cbc21 Fix up styling and methods