Fix insert compiler to return only first key if inserting multiple entities
No longer need to reset connection list with django 1.4
improved connection reseting for django 1.4
Remove XMLField test cases
Added a DjangoModelInputReader to allow mapreduce jobs to operate directly on django models
Added helper functions to easily mapreduce over django models
Added mapreduce docs
Fix input_reader memory usage by using cursors
Add input_reader test case