Merge pull request #343 from smuzaffar/IB/CMSSW_5_3_X/stable

rivet 1.9 included along with its dependency yaml-cpp 0.3.0
Merge pull request #385 from smuzaffar/IB/CMSSW_5_3_X/stable

updated xz-toolfile which adds xz/bin to PATH
updated das-client to 1.11.7