Removed error check that gives error when using provenance features.
-- features return empty hash map rather than zero
-- new new pipeline working with the union even when the main table does not contain all provenances (as in NIST)
-- added debug utility HFileLookup
-- jar updated
made the s2t and t2s provenance features symmetric. solves the problem
of having prov s2t lex prob with memory 4G in the reducer instead of 15G.
jar updated
added obsolete files to .gitignore