Update performance test README
Simple caching of get_submission() requests.

One of many small pull requests that are going to come for [TIM-279].
Fix metadata editor template error in Studio
Merge pull request #166 from edx/will/perf-doc-update

Update performance test README
Merge pull request #168 from edx/ormsbee/cache_sub

Simple caching of get_submission() requests.
Make django-debug-toolbar >= 1.0 work properly with syncdb and admin.

The autodiscovery used by admin will interact badly with Django
Debug Toolbar's own auto-setup. So we have to be more explicit about
everything and add some settings manually. See:

http://django-debug-toolbar.readthedocs.org/en/1.0/installation.html#explicit-setup
Merge pull request #171 from edx/ormsbee/django_toolbar_settings_fix

Make django-debug-toolbar >= 1.0 work properly with syncdb and admin.
Fix warning for submission in Studio preview
Merge pull request #170 from edx/will/fix-studio-preview-warning

Fix warning for submission in Studio preview
Merge pull request #169 from edx/will/metadata-editor-template

Fix metadata editor template error in Studio
Fix circular import
Merge pull request #172 from edx/will/fix-circular-import

Fix circular import
Update test for the circular import fix
Merge pull request #173 from edx/will/fix-self-api-test

Update test for the circular import fix
Create submissions command uses same JSON format as the XBlock
Merge pull request #174 from edx/will/update-create-submission-json

Create submissions command uses same JSON format as the XBlock
Stop waiting for peers to assess before logging in as a new user
Merge pull request #177 from edx/will/stop-waiting-for-grade

Stop waiting for peers to assess before logging in as a new user
Merge branch 'master' into jrbl/bugfix_helpfulness