Added support for page request level interceptors. Handling of annotations is left to interceptor implementations
Updates from code review
* Removed InterceptorFactory and replaced with autowired list
* Updated Javadoc on PageRequestInterceptor
Also
* Updated PageFactory unit test to cover interceptor functionality
Replaced wildcard import in PageFactoryTest with explciit imports
Merge pull request #13 from rowanseymour/interceptors

Added support for page request level interceptors