Initialize MakoMiddleware manually during certificate grading runs.

Without this, problems fail to load because they can't find how to
render themselves, and the certificate generation grading run will
get an inaccurately low count of the possible points a user could
get (anything they didn't see will be omitted), inflating their
grade during certificate calculation and making it inconsistent
with their Progress page.
Merge pull request #206 from edx/rc/2013-06-18

Rc/2013 06 18
Initial testing for parallelization
move override of MODULESTORE settings into ModuleStore test case class
Added the beginnings of self cleanup
Contentstore singleton is now cleared during teardown
Moved port range to rake file
Cleaned up import and comment
Fixed pylint/pep8 violations
Consolidated imports
Greater dir naming flexibility.

   Accepts any dirname for the edx-platform repo. Allows the script to be
   called from any directory, not just $BASE/edx-platform.
Moves user activation away from just clicking on reset password

To following the link in the password reset email
Tests + Now subclass PasswordResetForm instead of copy

Changed to subclassing django's PasswordResetForm and
overriding clean_password() instead of copy/paste.
Less lines to worry about for diff-cover this way =)
Call event.preventDefault() on notification action buttons

But allow you to specify that the event should not be prevented
Merge pull request #261 from edx/db/notification-event-prevent-default

Call event.preventDefault() on notification action buttons
Update CHANGELOG for per-student problem rescoring.
Test Mongo database is now unique and destroyed in teardown
Updated diff-cover to version 0.1.3 to fix a bug
Merge pull request #262 from edx/fix/brian/changelog

Update CHANGELOG for per-student problem rescoring.
Reorder imports on module_render