Feature/vik/oe ui

* Fix open ended grading javascript so multiple modules can be in the same vertical.
* Improve javascript by pulling out selectors.
* Enhance look and feel of module by redoing CSS and HTML in accordance with Marco's wireframes.

Start:

![multiple_oe_one_vertical](https://f.cloud.github.com/assets/913340/858262/72a62b5c-f562-11e2-9905-68cc16cea6d2.png)

Self assess:
![self_assess](https://f.cloud.github.com/assets/913340/858273/a2d30458-f562-11e2-8cfe-ce8ea03db14a.png)

Show rubric:
![show_rubric](https://f.cloud.github.com/assets/913340/858274/a5752416-f562-11e2-9d7f-8d2365699c9d.png)

@shnayder @marcotuts @natea Can you please review?