[WIP] Add RequireJS Optimizer.

**Ticket:** [TNL-481](https://openedx.atlassian.net/browse/TNL-481)

**sandbox:** http://studio.polesye.m.sandbox.edx.org/
**New Relic Page:** https://rpm.newrelic.com/accounts/88178/browser/4020167/v2_page_views
### Requests count:

Page  | Before | After
------------ | ------------- | -------------
[Dashboard](http://studio.polesye.m.sandbox.edx.org/course/) | 54 | 35
[Outline](http://studio.polesye.m.sandbox.edx.org/course/edX/DemoX/Demo_Course) | 66 | 37
[Container](http://studio.polesye.m.sandbox.edx.org/container/i4x://edX/DemoX/vertical/vertical_98cf62510471) | 114 | 55
[Advanced settings](http://studio.polesye.m.sandbox.edx.org/settings/advanced/edX/DemoX/Demo_Course) | 57 | 35
[Textbooks](http://studio.polesye.m.sandbox.edx.org/textbooks/edX/DemoX/Demo_Course) | 62 | 34

FYI: https://docs.google.com/a/edx.org/document/d/1pIyEaZ_bldy9riaXle0d59D_onJ7I_hISPqG0rhNIj8/edit#heading=h.lgqntoce8jlj

@andy-armstrong , @jimabramson , @cahrens , @auraz please review.
It is fantastic to move this out of the HTML file as it is so much easier to deal with! Would it be possible to share this logic with ```cms/static/coffee/spec/main.coffee``` now, so that we don't have to duplicate the dependencies?

Also, is it possible to have one config file use another one? I'm thinking about what we'll do when the LMS also uses RequireJS. It would be great if all the common dependencies lived in a config file under ```common```, and then this file could just include it.