Finalizing AK5 -> AK4 transition

Here is the last expected change for the AK5 -> AK4 transition. The AK4 and AK8 global tags are now present at RECO and HLT level. I have moved the defaults from AK5/AK7 to AK4/AK8 now. 

NOTE : This will break some workflows because the HLT global tag does not include them (and from my understanding, will not include them). 

See here for details : https://hypernews.cern.ch/HyperNews/CMS/get/hlt/3587/1/1.html

- Will break at least matrix workflow 5.1, 1200.0 for the above known problem.

- Tested on matrix workflows 1341.0, 1003.0, 4.22, with no problems.

- Tested on matrix workflow  25202.0, found problem in "step5". I think we need the JEC Uncertainty Sources for AK4. I don't think this should be a showstopper for inclusion in RECO though : 

Reading JEC parameters = SubTotalMC from file = /build/srappocc/CMSSW_7_2_X_2014-09-15-0200/src/PhysicsTools/PatUtils/data/Summer13_V1_DATA_UncertaintySources_AK5PF.txt.
Reading JEC parameters = SubTotalMC from file = /build/srappocc/CMSSW_7_2_X_2014-09-15-0200/src/PhysicsTools/PatUtils/data/Summer13_V1_DATA_UncertaintySources_AK5PF.txt.
15-Sep-2014 21:00:46 CEST  Closed file file:step3.root 
----- Begin Fatal Exception 15-Sep-2014 21:00:46 CEST-----------------------
An exception of category 'JetCorrectorParameters' occurred while
   [0] Constructing the EventProcessor
   [1] Constructing module: class=SmearedPATJetProducer label='selectedPatJetsForMETtype1p2CorrResDown'
Exception Message:
No definitions found!!!
----- End Fatal Exception -------------------------------------------------