Rename ambiguous parameters; uncomment makeblastdb test
Try to reorder <extra_files> to match ls order from makeblastdb
Try testing ncbi_makeblastdb.xml with TravisCI
Update README files with planned BLASTDB changes
Switch BLAST DB from basic to auto_primary_file composite datatype
Capture makeblastdb stdout as (dummy) primary output file

(Header line via echo solves the strange two blank lines at
the start of the makeblastdb stdout)
Update makeblastdb test (now passes)