py2-sqlalchemy: new external at 0.8.2 version

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge remote-tracking branch 'cms/IB/CMSSW_7_0_X/stable' into IB/CMSSW_7_0_X/stable
Merge pull request #125 from davidlt/IB/CMSSW_7_0_X/stable

[CMSSW_7_0_X] Add SQLAlchemy 0.8.2