Fixes #4856: update Rudder for last specs2 version
Fixes #4859: Sort node id list system var to preven useless regeneration
Merge pull request #515 from fanf/bug_4859/sort_system_var_nodeids_to_prevent_regeneration

Fixes #4859: Sort node id list system var to preven useless regeneration
Merge pull request #513 from fanf/arc_4854/4856_update_specs2_rudder

Fixes #4856: update Rudder for last specs2 version
Merge branch 'branches/rudder/2.10'

Conflicts:
	rudder-core/src/main/scala/com/normation/rudder/services/policies/SystemVariableService.scala
Merge branch 'master' of github.com:Normation/rudder
Fixes #4861: Fix link when using a different context path
Fixes #4781: Remove rule variable kind
Merge pull request #501 from fanf/arc_4478/impl_4781_remove_rudder_rule_variables

Arc 4478/impl 4781 remove rudder rule variables
Merge pull request #516 from VinceMacBuche/bug_4861/Add_prefix_utl

Fixes #4861: Fix link when using a different context path
Fixes #4771: Rule grid use now json as Data
Merge pull request #503 from VinceMacBuche/ust_4770/implem_4771/rule_optimization

Fixes #4771: Rule grid, now stored as Json
Fixes #4794: Refresh Rule table