Initial equalTo() autoboxing implementation
Default to prefixed auto-boxing macros, cleanup constraint implementations
Added back public MASConstraint constant setters, cleanup
Added doc comments for new stuff
Added tests for equalTo NSValue arguments and autoboxing
Updated example with autoboxed equalTo usage
Added MASConstraint private header
Unprefix _equalToWithRelation and _valueOffset
Added an actual implementation for mas_ relation methods
Merge pull request #62 from nickynick/equalTo-autoboxing

Autoboxing for scalar/struct attribute values