As some i18n features need ```ugettext``` or its shorcut ```_``` to be called on a non-string-literal, so the pylint check of ```translation-of-non-string``` should be explicitly disabled in such situations.

Conflicts:
	lms/djangoapps/courseware/courses.py
	lms/djangoapps/instructor_task/api.py

refined entrance exam student attempts reset

Quality improvements 1/16

added rescore, delete state and task history functionality

added unit tests for entrance exam reset attempts

added unit tests for re scoring of entrance exam and task history

improved test coverage

Got rid of pep violation

feedback changes and added jasmine test

added more jasmine tests for Javascript changes

added bok-choy tests for UI changes

replaced input containing <p> tags with <label>

Removed ee element assertions to avoid js error

Added call to super.setUp()

changes based on feedback on 2/18

Writing tests in JS instead of coffee script

commit related to skip entrance exam 2/13

fixed bad-continuation quality error

fixed broken bok-choy test

changes based on feedback on 2/18

added js tests and removed coffee script tests

fixed broken bok-choy and unit tests

changes left while rebasing

rephrase test titles

do not need these libs

changes based on feedback on 2/24

changes text which was left

Changes based on feedback on 3/3

Hook up display of grade files ready for download to new instructor dashboard.

LMS-58