Adding null support to array transformers
No longer test for exceptions when parsing NSNull
WS
Improving documentation on JSON serialization

There was some confusion that MTLJSONAdapter should be used instead of
+[MTLModel modelWithDictionary:]. See #94.
Reformatting the README
Adding code examples to README
Fixing possive of superclass
More README improvements
Improving style
Merge branch 'master' into improving-docs
Fixing property declarations

No clue what was going on there
Structuring +JSONKeyPathsByPropertyKey explanation
Removing mention of date formatter sharing
Moving up MTLJSONAdapter section
Fixing typo
Removing XYEntity form XYUser example
Improving documentation for +JSONTransformerForKey:
Improving documentation for +classForParsingJSONDictionary:
Fixing XYMessage superclass
Show -mtl_dictionaryByAddingEntriesFromDictionary