Merge branch 'release/0.26.4' into develop
Switch  to sparks @master and use Cython 0.20.1.
Upgrade celery `flower` to 0.6.
Upgrade raven, lxml and requests requirements to latest version.
ignore .pipcache
Re-write the bootstrap target so that it's completely run on OSX (comments in the middle seem to stop execution for some [bad] reason).
Make STATSD_* settings able to be unset without crashing the whole app.
Push lxml to 3.3.3.
Merge tag '1flow-0.26.4.1' into develop

0.26.4.1

Conflicts:
	Makefile
Remove AMQP hard-numbered dependancy, celery will already pull its own required version.

This crashed the 3.0 -> 3.1 migration...
Update celery settings to avoid a warning about pickle, and disable the now-useless GZIP compression.
Remove AMQP hard-numbered dependancy, celery will already pull its own required version.

This crashed the 3.0 -> 3.1 migration...
Update celery settings to avoid a warning about pickle, and disable the now-useless GZIP compression.
bump version for 0.26.4.2
Merge branch 'hotfix/0.26.4.2'
Merge branch 'hotfix/0.26.4.2' into develop
WOW. Picky Celery... When you say it will be disabled, don't serialize with it by default !!
WOW. Picky Celery... When you say it will be disabled, don't serialize with it by default !!
version bump for hotfix.
Merge branch 'hotfix/0.26.4.3'