Reordered the files by subdirectory in the Data CMakeLists.txt.
Added KTAnalysisCandidates and KTMCTruthElectrons to Data/Evaluation (new directory)
Merge branch 'refs/heads/Maintenance' into CompareCandidates
Added new data classes to the CMakeLists.txt.
Added empty Input directory.
Merge branch 'refs/heads/Maintenance' into CompareCandidates
Renamed KTMCTruthElectrons --> KTMCTruthEvents
Added KTJSONReader and KTReader. KTJSONReader is only partially implemented, but works as far as it's complete.  Also added validation program TestJSONReader.
Finished implementing KTAnalysisCandidates and KTMCTruthEvents.