auto-update-git-branches: merge CMSSW_7_2_X stable into gcc491

CMSDIST for `stable' and `gcc491' are out of sync. Merge `stable'
into `gcc491'.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Merge pull request #99 from davidlt/merge-72x-stable-into-gcc491

auto-update-git-branches: merge CMSSW_7_2_X stable into gcc491