Merge pull request #4 from we4tech/active_model_support

Added support for none active record model, which has no after_commit ca...
technical
No ActiveSuport dependency
some refactoring update index logic
Merge branch 'master' of github.com:EvilFaeton/tire_async_index
Update README.md
no constantize
Merge branch 'master' of github.com:EvilFaeton/tire_async_index
ensure action_type from redis
shame on me
version bump
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/tire_async_index/workers/update_index.rb