Use [NSBundle bundleForClass:] to ensure bundle is found

- In some configurations, [NSBundle mainBundle] is set to [xcode bundle]/usr/bin
- [NSBundle bundleForClass:[self class]] should always find the app's bundle
Merge pull request #55 from kattrali/load-test-bundles

Use [NSBundle bundleForClass:] to ensure bundle is found
Handle mapping booleans for strings

Example: @“true” or @“false” should map, currently it maps them to
false.
Merge pull request #56 from mps/string-booleans

Handle mapping booleans for strings
Add support for sorting

Allows for single and multiple sort specifiers of types:
- Property name
- Property name and direction (dictionary)
- NSSortDescriptor

Did not implement any parsed string formats for the sake of simplicity
but they could certainly be implemented later without breaking
compatibility.

Added ordering method variants where they seemed useful while
preserving all existing method signatures for backward compatibility.
Implemented code review comments
Improved ordering tests
Merge pull request #57 from jeremymailen/feature/order

Add support for sorting
Enable predicate-like formatting with va_lists in whereFormat.
Merge branch 'master' of https://github.com/Hout/ObjectiveRecord

Conflicts:
	Classes/CoreDataManager.m