Merge pull request #1 from dmishe/master

Heroku fixes
tell gunicorn to look for https
Merge pull request #2 from dmishe/https_gunicorn

tell gunicorn to look for https
PEP8
Removed X-Forwarded-Proto header handling from SSLMiddleware.

This is handled by Gunicorn now.
Updated Sentry to 4.8.0
Updated Sentry to 4.10.0
Added social auth configuration.
Downgrade Django to 1.3.1
Downgrade kombu
Added django-secure.
Added django-bcrypt.
Upgraded Sentry to 5.0.5
Use gunicorn directly to start Sentry.

This should solve https://github.com/getsentry/sentry/issues/400
update readme to reflect the changes in Sentry configuration and Heroku's database addon.
Added sentry-github extension.
Revert "Use gunicorn directly to start Sentry."

Should not be necessary anymore since #400 in Sentry is fixed.
3 workers performs better in Heroku.
Update Sentry et al.
Possible fix for redirection loop