Addition of 3 TinyMCE plugins

The following plugins added to toolbar in Edit of Unit:
 - fontselect
 - forecolor
 - image
fixed conflict between Annotator and internationalitation
Change name of bok-choy XML coverage report to avoid combining it with the unit test reports
Do not translate checkbox values
Merge pull request #2548 from edx/diana/drupal-registration-i18n

Don't internationalize strings we use for enrollment.
Ora page object retries even if rubric doesn't load
Refactor stub implementation of LTI Provider. BLD-601.
Merge pull request #2029 from edx/oleg/lti_stub_refactor

Refactor stub implementation of LTI Provider. BLD-601.
Merge pull request #2536 from edx/will/bok-choy-coverage-name

Change bok-choy coverage XML filename
BLD-658: Add view for field type Dict in Studio.
Merge pull request #2478 from edx/anton/add-view-for-dict-in-studio

Add a view for the field type Dict in Studio.
Persist student progress in video.

Student logins to edx, plays video, selects position, closes
browser, opens video, position is restored.

BLD-385
Merge pull request #2365 from edx/anton/store-video-progress

Anton/store video progress
pep8/pylint cleanup on symmath/formula.py
Merge pull request #2549 from edx/zoldak/things-not-to-translate

Do not translate checkbox values in html files
Merge pull request #2558 from edx/will/more-robust-ora-page

Ora page object retries even if rubric doesn't load
Merge pull request #2538 from edx/sarina/fixup-symmath

pep8/pylint cleanup on symmath/formula.py
i18n Sequence XModule
BLD-824: Download Video link missing from video player.
Merge pull request #2560 from edx/sarina/fix-i18n-xmodule-sequence

i18n Sequence XModule