Fixes a couple of issues

- Recursive model schemas cause sample model JSON generation to have a stack overflow error
- List and Set property types are not handled correctly (just like Array types)

fixes issues #32, #33
Merge pull request #34 from dilipkrish/master

Fix for model JSON generation from schema for Recursive types and List and Set types
updated version, build
updated to support 1.2 spec responseMessages
added support for 1.2 spec