Update Exotica_HSCP_SIM_cfi.py

needed for central production requests EXO-Fall13-00199 ---> EXO-Fall13-00236
Merge pull request #4891 from davidsheffield/patch-1

Update Exotica_HSCP_SIM_cfi.py
Merge remote-tracking branch 'origin/CMSSW_6_2_X' into CMSSW_7_0_X