Null check and merge bean validation ids

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9873 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Refactored Bean Validation integration for Client Side Validation framework, added support to use custom constraints as client side validators.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9874 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c