Joshua Harlow 7277a73f8c Add persistence docs + adjustments ...

- Increase the level of docs around why the persistence
  objects exist and what they are used for and how an
  engine interacts with persistence objects to accomplish
  the wider goals.
- Pass backend conf as arg, not kwarg and to match with the
  other fetch/load functions allow for providing a kwargs
  which can be used for backend specific params.

Change-Id: Ia83e63196bcfcc966f68212f84f79a1e9f18e8bc

2014-04-20 11:58:35 -07:00

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Add persistence docs + adjustments

2014-04-20 11:58:35 -07:00