1.5.0 Release

This major release refactors edx-proctoring to be a pluggable Django app and allows third-party backend proctoring providers to be dynamically enabled.

Pre release 1.5.0rc7

Merge pull request #495 from edx/dcs/config-perm

Check for file permissions

1.5.0rc6: Add configurations for proctored exam ping functionality

At the proctoring provider level, this allows us to
1) specify different intervals for pinging via configuration changes
2) allow ping failures to continue in emergency conditions via waffle

Pre release 1.5.0rc5

Fixes uglifyJS parsing errors

Pre release 1.5.0rc4

Merge pull request #489 from edx/dcs/review-link

Include a direct link to the review in support tickets

Pre release 1.5.0rc3

Merge pull request #487 from edx/dcs/pluggableapp

Enables the use of the Open edX Pluggable Django App framework

Pre release 1.5.0rc2

Merge pull request #486 from edx/dcs/attemptcode

Don't override the attempt_code

Pre release 1.5.0rc1

Merge pull request #476 from edx/dcs/local-instructions

Use instructions from the subclass instead of from the API request

Pre release 1.5.0b3

Merge pull request #471 from edx/dahlia/proctoring-master

Dahlia/proctoring master

Pre release 1.5.0b2

Merge pull request #467 from edx/dcs/instructor-dashboard

Added review dashboard launcher for instructor dashboard.