refine infrastructure; add 1st subset of CHORUS data
Merge branches 'master' and 'GENIE_2_8_br_JY01'
improve code to add observable-specific analyzers if corresponding dataset(s) exist(s)
Merge branches 'master' and 'GENIE_2_8_br_JY01'
Merge pull request #24 from yarba/master

further improve infrastructure and add 1st subset of CHORUS data