Update ISSPropertyRegistry.m

using attributedTitle with UIButton was throwing an exception
Code was validating against a selector, but then calling wrong method.
Merge pull request #4 from tbrannam/patch-1

Merged fix for use of incorrect setters for property `attributedTitle`.
Moved styling disabled check to top of applyStylingInternal.
Moved obj-c runtine introspection handling to new class ISSRuntimeIntrospectionUtils.
Updated handling of prototypes in view definition files to support assigning child element to property in any ancestor element. Fixes #5.
Updated section for version 0.9.12.
Added unit tests for attrbuted strings.