Merge pull request #232 from ktf/master

Do not assume scripts are in $WORKSPACE.
Setup IBs for CMSSW_7_4_GEANT10_X
Merge pull request #233 from nclopezo/add-74-geant10-ibs

Setup IBs for CMSSW_7_4_GEANT10_X
Disable CMSSW_7_3_DEVEL_X and CMSSW_7_3_GEANT10_X IBs
Merge pull request #234 from nclopezo/disable-73-geant10-devel

Disable CMSSW_7_3_DEVEL_X and CMSSW_7_3_GEANT10_X IBs
move icc build to 74x
typo: fix CMSSW_TAG for 74ICC
Merge pull request #235 from smuzaffar/master

move icc build to 74x
Merge pull request #236 from ktf/master

Run cms-init before doing a git config.
Define a few git variables globally.