accept ignorable types for parameter annotation type

It is changes to allow ignore an annotated parameter into documentation.
For example: I have an custom annotation  which determine Integer parameter using an interceptor.
Also, I need to ignore the parameter into swagger ui because the parameter determined from http header.

@UserParam need to be ignored into swagger ui
![useraddresscontroller_java_-__group-buy__-_group-buy_-____documents_build_gb_](https://f.cloud.github.com/assets/1741116/2386280/c74e65e0-a929-11e3-86ce-2a8f0a4f91bf.png)