support for Run 1 ntuples

include a prefix command to run CMSSW 5

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changed title from Plan support for Run 1 ntuples to support for Run 1 ntuples

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@vpadulan suggested to look into TFile::MakeProject to come across the different version of CMSSW.

For a somewhat self-contained example of MakeProject usage, I recently introduced a test that covers the whole pipeline from writing a TTree with a class that needs a dictionary to reading it back from another program that does not have access to the dictionary. Find it at https://github.com/root-project/roottest/tree/master/root/ntuple/makeproject/ttree