Update data-Fireworks-Geometry and implement github method for building data.

See also cms-data/Fireworks-Geometry#5.
Merge pull request #1092 from degano/fireworks_data_SLHC_slc5

Update data-Fireworks-Geometry and implement github method for building data.
Merge remote branch 'origin/IB/CMSSW_6_2_X/stable' into IB/CMSSW_7_0_X/stable