RestKit/RestKit — pull request #857 by leepfrog (2012-07-16 09:51:02+00:00)
Title: RKFetchedResultsControlller: Give fetchRequest property priority over Mapper

As it stands, if you attempt to use this code, it will not work:

```objective-c
self.tableController.resourcePath = @"/projects";
self.tableController.fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Project"];
```
This is because the RKFetchedResultsController is giving priority to the resourcePath (mapper) instead of the fetchRequest property. Even worse, if the mapper does not implement a fetchRequest block for the given resourcePath, the program will crash.

In this PR, I modified the conditional to give priority to a manually set fetchRequest instead of giving priority to the mapper.