run edmPluginRefresh for lib and biglib both
set cmssw env before running edmpluginrefresh
typo: fix for loop in post install for plugin cache
Merge pull request #868 from smuzaffar/IB/CMSSW_7_2_X/stable

fix for running edmPluginRefresh for both lib and biglib
Merge remote branch 'origin/IB/CMSSW_7_2_X/stable' into IB/CMSSW_7_0_X/stable