TNL-3467

Even when the icon is updated to fa, nothing happens when
the icon is clicked.

TNL-3799

Staff assessments can now mark workflow as being done, with proper handling
for blocking workflows (such as peer), to hide a score if the submitter
has not yet fulfilled their obligations. Includes tests.

Previously, I moved some assumptions out of class contstants and into
code, in `start_workflow()`. Turns out, it's also possible to load a model
from the database, which bypasses this check and fails to fill out self.STATUS
properly. Refactoring so that `include_staff_in_class()` gets called in both
cases.

Changes include:
    -modifies requirements to gt an updated version of edx-submissions
    -adds set_staff_score to the AssessmentWorkflow model, which will record
        a new annotated score using edx-submissions functionality
    -prevents recording non-staff scores if a staff score exists
    -modifies update_from_assessment to call set_staff_score as needed
        -this includes changes to both the workflow model and its api
    -modifies get_score to allow staff overrides as optional
    -modifies the assessment serializer to include id information
        -adds this information to get_score method in self, ai, peer, and staff
            apis, to expose c ontributing_assessments where needed
    -fixes a small bug regarding None vs {} in the peer api
    -adds staff-assessment to the xblock, and makes it always available
    -uses the new force_update_score parameter on the workflow api when
        recording a staff assessment

TNL-1162

Increase the comment textarea size to 1000

Fix styling issue with ORA staff tools

TNL-3845

Speed up the translation process

Bump the version number to 0.2.3

Update translations from Transifex

Miscellaneous small improvements

* Bump version numbers
* Introduce JSCS style validation
* Address style failures

fix travis configuration

Mzfr/django18 from release

Conflicts:
	.travis.yml
	settings/test_with_coverage.py
	setup.py

Remove django-celery

Adding html to black list for custom file types.

TNL-3767

update library version
update django-extensions