frac-ified ECAL cluster shapes mainly used in EXO analysis
Address the code review issues pointed out in #1986
Merge pull request #2044 from lgray/fixes_EXODQM_1986CodeReview

Reco fixes -- Fixes to Cluster Shape Variables monitored in EXO DQM + #1986 Code Review
Merge remote branch 'origin/CMSSW_7_0_X' into CMSSW_7_0_X