Kf html edit

Added new styles for the sequence nav including completeness

Added fix for the sidebar buttons in the courseware

Scroll the caption upon video seeking

I'll go ahead and merge this, since it fixes nearly all the issues we had with problem and html css, and this should go in before more changes.  The table borders can be fixed in another round.

Usage: `rake cms:import DATA_DIR=<path_to_your_data_dir>`

Roundtrip HTML module editing working in the CMS

Victor/xml testing

TODO:
  - support picking a different course name
  - make it use current module rendering path, get that working.

* wasn't passing namespace properly in parse_course_file

* Separate out all xml processing code from django code
* Preparing to move the content parsing parts into common/lib/xmodule (?)

bugfix: lcp score can apparently be 0/0

Victor/show student state

* use clearer names for the two status strings passed to js
* add functions to do canonical conversion of progress to js string
* fix updating bug in sequence.coffee
* add some todo comments and other docs to make future expansion easier

* change bottom border of links:
  red for not started
  yellow for in_progress
  green for done

* This should probably be designed at some point.
* Obvious problems: the yellow is not very visible, and lots of people are
  red/green color-blind.