Implementing the AsyncQuery method and the async value generation code.
Enabled the NorthwindAsyncTests and updated the tests for value generation.
Combined various methods in RedisDatabase and RedisQueryContext etc to
return object[]'s and put materialization/projection into
QueryMethodProviders.
Cleaning up Redis SimplePoco tests
Added support for sequences to migrations.
Added the following migration operations: MoveSequence, RenameSequence, AlterSequence.
Added unit tests.
NuGet Commands: Support win81, wpa81 & portable projects