Added test to demonstrate issue #378: missing serialize only properties during scan

* Added spec to ApiModelReaderSpec.groovy
* Added test data model with serialize only property
* Added resource method using data model as return and request param

Conflicts:

	swagger-springmvc/src/test/groovy/com/mangofactory/swagger/readers/ApiModelReaderSpec.groovy
Fixed ModelWithSerializeOnlyProperty to work with jackson 2.0 introspector
Added mergeModelMap to ApiModelReader; fixed #378
Merge branch 'issue378'

Conflicts:
	swagger-springmvc/src/test/groovy/com/mangofactory/swagger/readers/ApiModelReaderSpec.groovy