Remove repr implementation
Fix doc for optimistic_insert
Change query from list to single object
Merge branch 'storage-abc' into develop
Fix query default on Storage::remove()
Merge branch 'remove-redefinitions' of https://github.com/sloria/modular-odm into develop
Allow Mongo backend to take multiple queries on a single field

E.g. Q(‘foo’, ‘in’, [‘bar’]) & (Q(‘foo’, ‘nin’, [‘baz’])