Allow change the error level of "Invalid derived Query!" for spring data

The methods of repository may not follow the standard of Spring data if custom factory is used to override the function of Spring Data JPA repository. It is allow to do so, but STS will show the "Invalid derived Query!" Error annotation next to those method.

It is better to allow us to choose the error level of the "Invalid derived Query!"

http://forum.springsource.org/showthread.php?129458-STS-3-0-0-Spring-Data-support-can-i-change-error-level-of-Invalid-derived-Query!