Algoliasearch

* [CHANGE] Module name to avoid conflict when installing the package with pip
* [CHANGE] Big performance improvements
* [ADD] Option to raise or not exceptions. By default, raise only when DEBUG=True
* [ADD] Create multiple AlgoliaEngine with different settings
* [ADD] Auto-indexing option at registration time
* [FIX] algolia_reindex command with batchsize argument on python34-django18
* [FIX] Fields syntax
* [FIX] Avoid mutable default parameters
* [FIX] Fix bug in error handling

* [FIX] Default to model.pk instead of 'id'

* [FIX] Fix --batch-size of reindex command on Django 1.7

* [FIX] Check that geo_field callable returns something valid

* [FIX] Compatibility warning with Django 1.9

* [ADD] `get_queryset` for grain indexing possibility
* [ADD] Option to deactivate auto-indexing
* [FIX] Various bugs