Added array mapping transformer and refactored mtl_JSONArrayTransformerWithModelClass: to use it
Whitespace fixes
Check reverseBlock is not nil
Whitespace and indentation fixes
End header comment sentences with a full stop.
Added tests for array mapping transformer
Improved test readability
Separated out array mapping transformer tests by reversible and non-reversible conditions
Changed description of array mapping transformer test
Header doc for arguments that must not be nil
Merge pull request #248 from dcaunt/array-mapping-transformer

[WIP] Added array mapping transformer and refactored JSON array transformer