Merge pull request #7 from kkiesel/master

UI change: pass configuration setting via command line
Surrounded the CMSSW environment specific code with #ifdefs so that that may be turned on and off in one place rather than hunting around in code.  Left off by default, as use outside the CMSSW env. has always been a design requirement of the ntuple analysis code...

Some conditional expressions were used in if statements that seemed to be sabotaged by operator precedence, so likely didn't do as intended.  Surrounded with parentheses.
Commenting out the SetBranchStatus lines by default, as they seem to cause segfaults depending on what's read.
Changing for macosx64 from g++ to clang++ -- likely need to look at the command line options as well.  Only takes effect for macos...
Changed global tags

As recommended[1] the global tag for 53x MC and Run 2012 was updated.

[1] https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideFrontierConditions#Winter13_2012_A_B_C_D_datasets_r
moved runOverAOD.py into python directory
corrected the import statement on the first line
changed input path
moved file in python subfolder
Merge branch 'master' of github.com:CMSSUSYPhotons/SUSYPhotonAnalysis
updated if for 52x FastSim