updated scram version to V2_2_5_pre8 which now prints only warning for scram_arch/os mismatch
Merge pull request #656 from smuzaffar/IB/CMSSW_5_3_X/osx107_amd64_gcc462

updated scram version to V2_2_5_pre8 which now prints only warning for scram_arch/os mismatch