Tests passing
Now depends on Kombu 2.5.5
Updates Changelog for 3.0.14
Cosmetics
Refactores event states to allow pickling

Conflicts:
	celery/events/state.py
Fixes docstring
LRUCache is pickleable
Makes events.state.State pickleable
Merge branch '3.0' of github.com:celery/celery into 3.0
dummy -> memory for CELERY_CACHE_BACKEND
Sets heartbeat checkrate to 3 by default
Now depends on billiard 2.7.3.20
Now depends on kombu 2.5.6
Updates Changelog
Bumps version to 3.0.14
Must now enable CELERY_CHORD_PROPAGATES to get the new chord error behavior
Updates Changelog
Tests passing
Fixes event dispatcher bug
Tests passing