Fixes #3387 : add a cache in the RuleGrid to prevent duplicate queries
Merge pull request #153 from ncharles/bug_3387/dev/add_caching_in_grid

Fixes #3387 : add a cache in the RuleGrid to prevent duplicate queries
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5
Merge branch 'branches/rudder/2.5'

Conflicts:
	rudder-core/src/main/scala/com/normation/rudder/repository/ldap/LDAPDirectiveRepository.scala
	rudder-web/src/main/scala/com/normation/rudder/web/components/RuleGrid.scala