This reverts commit 66b949b7.

modulestore, in order to separate serializable block data from
out-of-band, non-saved, temporary metadata.

Eliminate the deepcopy causing performance problems with import/export.

https://openedx.atlassian.net/browse/PLAT-416

This fixes two bugs:
1. All statuses were listed as "Unknown"
2. Non-ASCII characters in a header column translation resulted in a 500

Bok Choy test now passes

make course requirement as link

Added 'is_entrance_exam' to FILTERED_LIST plus a new bokchoy test

Update "paver i18n_dummy" to compile assets

updating bokchoy version

Change instances of 'register' to 'enroll'

[TNL-1264] changes the skip link text to the industry standard Skip to main content

Fix unit tests.

Video player branding addition for XuetangX

Fixed transcript skip first line if it contains BOM(Byte Order Mark).

TNL-935

removed the is_invoice condition from the pdf file

Fix recommenders' bugs: initialization, syntax error, and the incompatibility of the underscore library

Add RequireJS to the LMS

[second attempt which addresses bug building Studio]

Fix recommenders' bugs: template_lookup initialization, syntax error, and the incompatibility of the underscore library

Update Pillow to 2.7.0

TNL-1078: Lines don't break correctly in Student Notes.

Fix intermittent failures in bok-choy tests of payment and verification

Add missing sysadmin dashboard unicode cast

Invalid youtube_id raise NotFoundError for transcripts