o Now all static byOrganism() methods infer the organism from the passed
  argument via getOrganism() if not already a character string, e.g.
  gtf <- GtfDataFile$byOrganism(fa) where fa is a FastaReferenceFile.
Merge branch 'master' of github.com:HenrikBengtsson/aroma.seq
BUG FIX: getSeqNames() for FastaReferenceFile would return the
sequence description in addition to the ID as part of the name.