Implemented first phase of #7. Linked all necessary attribute processors to RequestDataValueProcessorUtils class
Update to dialect XML files after thymeleaf/thymeleaf#233
Moved RequestDataValueProcessorUtils to package 'requestdata'
Updated spring compile-time dependency to 3.1. Compatibility will be kept with 3.0
Closes #7. Implemented delegation to Spring-configured RequestDataValueProcessor in Spring 3.1+