Teacher Dashboard Iteration 7 - Edit stimuli order 

Modified datalists so they could handle contextualized datalists (sub experiments of phophlo)

* Displaying reinforcement cartoons
![screen shot 2014-09-04 at 4 08 53 pm](https://cloud.githubusercontent.com/assets/196199/4165271/7a7ee312-3500-11e4-9832-ef33cd56289c.png)

* Added drag and drop and remove functionality for stimuli so users can manage stimuli order
![screen shot 2014-09-04 at 4 09 40 pm](https://cloud.githubusercontent.com/assets/196199/4165266/75173366-3500-11e4-9114-756652dda1c3.png)