Fix source playback in use_warc=True mode.
Merge pull request #518 from jcushman/dev.warc2

Fix source playback in use_warc=True mode.
Add custom server_error views so that we can send REQUEST_CONTEXT [and thus get STATIC_ROOT]
Make the <title> of the 500 error say '500' instead of '404'
Fix typo in urlconf for upload_link URL
Some celery config for wsgi.py
Add phantomjs file variants in lib/phantomjs to .gitignore
Make sure the 404 and 500 views return the right status codes
Merge pull request #521 from leonidg/leonidg-misc

Leonidg misc merge. Some cleanup and a
Some JS was breaking when being jammed together by django-pipeline.
Fixed, I hope. Fixes #524

Also ran into a string concat issue in models. Fixed.
Merge branch 'develop' into develop.docs-v1