issue-4-core-data-migration

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fixed recursion issue in searching mapping model

2

``` [NSMappingModel mappingModelFromBundles:@[[NSBundle mainBundle]] forSourceModel:sourceModel destinationModel:model]; ``` when params sourceModel and model are equal (v2), this method returns mapping model from v2 to v3 see this diff https://gist.github.com/pnc/2321704

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