Quiet the doc and i18n scripts
Add locale to i18n script
Use PhantomJS as the headless test runner.
Refactor file upload tests

Move openassessment out of the apps directory
Use pkg_resources to check whether OA XBlock is installed.

This introduces a few features:
* INFO level logging on common events like creating or fetching
  submissions and assessments.
* Parallel event logging for the same.
* Creates a local logs/ directory for development.

For the most part, we rely on XBlock's publish() mechanism to emit
event data. However, because scoring is done at the API layer in a way
that is not directly visible to the OpenAssesmentBlock, we're logging
that event separately with a hacky solution that dynamically loads an
emit function based on a configuration value. This is a stopgap
measure until we can start using the edX analytics API (which is still
in testing).

TIM-260, TIM-378

One of many small pull requests that are going to come for [TIM-279].

Wiring all the peer queue into place

Updating based on rebase to fix tests

Implement self assessment api

[TIM-202]

Deprecate scenario parser in favor of XML serializer for studio
Clean up validation logic for assessments and add tests.
Add missing test cases for XML serialization/deserialization
Increase browser timeout for Karma (prevent failure in Travis)
Erase coverage between test runs (more accurate reporting)