Consumes migration

Migration to consumes usage for the CastorRawToDigi and CastorDigiToRaw modules. The changes are quickly tested by running a full MC chain (Step1: GEN-SIM-DIGI-RAW and Step2: RAW-DIGI-RECO) that uses both modules. The output file showed correctly filled Castor objects. Tested in CMSSW_7_1_0_pre4.