Template migration and filter fix for Egamma
Fixed non-const statics for DetectorDescription/Core
Removed use of UpdaterService from CachingVariable

The service UpdaterService can not work in the threaded framework. Therefore UpdaterService was removed from CachingVariable. In its place the CachingVariable uses the new cacheIdentifier of edm::Event to know if a new Event is being used.
Merge pull request #1424 from Martin-Grunewald/EgammaUpdate

HLT fix -- Template migration and filter fix for Egamma
Merge pull request #1455 from Dr15Jones/removeUpdaterServiceFromPhysicsToolsUtilAlgos

Multithreading fixes -- Removed use of UpdaterService from CachingVariable
Merge pull request #1450 from nclopezo/threadSafetyDetectorDescriptionCore

Multithreading fixes -- Fixed non-const statics for DetectorDescription/Core
Merge remote-tracking branch 'origin/CMSSW_7_0_X' into CMSSW_7_0_X