CMSSW_7_1_21_patch1

Changes since CMSSW_7_1_21:

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1. 13294 from @covarell: added snippet files for tune uncertainties generators created: 2016-02-15 17:59:04 merged: 2016-02-18 11:16:41

CMSDIST Changes between Tags REL/CMSSW_7_1_21/slc6_amd64_gcc481 and REL/CMSSW_7_1_21_patch1/slc6_amd64_gcc481:

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