Update unused types.
Generate keg events with drink events.

This only affects situations where the event doesn't already
exist, such as in `regen_events`.
Add `stopasgroup=true` to worker config.

Issue #263.
runner: Set session id in preexec.

Issue #263.
PEP8 fixes (1/2).

Automatically generated with `autopep8`, command:
  `autopep8 --ignore=E128,E265,E309,E501,W601 --exclude=migrations --max-line-length=99 --recursive --in-place`
PEP8 fixes (2/2).

Generated by hand.
Add flake8 config.
Delete celery_app setup.
Lint fixes.
Run flake8 as a unittest.
plugin: Register plugins by name; share reference to registry.

`plugin_registry` allows plugins to inspect other installed
plugins in an injectable fashion.
plugin: Fix regression in 838962e; add tests.
plugin: Add foursquare test.
Bump Django, Celery, and Pillow deps.