learningequality/ka-lite — pull request #1665 by wangguan59 (2014-03-03 07:03:09+00:00)
Title: Adding acceptable formats and tooptip

Adding math format, and Move tipping tool styling in Khan_exercise.css,
![screen shot 2014-03-02 at 7 47 26 pm](https://f.cloud.github.com/assets/1319955/2307134/4629c02e-a2a1-11e3-8468-ea6221767281.png)