entity syncing uses sync for relationships and upsert
did minor optimizations to entity syncing
bumped version
Merge pull request #29 from wesleykendall/feature/optimize

Feature/optimize
added entity registry and entity config model
added basic entity registry tests
updated entity registration tests
tested register decorator
entities are registered new way in models
entity registry works with previous tests
changed how the entity registry stores information
num queries went down a lot with optimizations
100%
started construction of entity syncing using a class that maintains the entity cache
updated syncing to use cache and updated manager utils
tested entity syncing with multiple entities
added m2m support
more testing on turning on/off signal handlers
made failing test case for watchers
working with watchers now