Replace RequestFactoryInterfaceValidator with an annotation-processor-based
approach.
Add a ValidationTool to precompute server and JRE-client metadata.
http://gwt-code-reviews.appspot.com/1503804
http://code.google.com/p/google-web-toolkit/wiki/RequestFactoryInterfaceValidation
Patch by: bobv
Review by: rjrjr, tbroyer


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10542 8db76d5a-ed1c-0410-87a9-c151d255dfc7