GFF3 loader now chomps off /.*:/ from all GFF3 record IDs. (split(/:/)[1])

Project.xml GFF3 source now accepts another optional property called:
"gff3.typeMappingFile" which maps record types to desired InterMine
classes.  For example: "messenger_RNA	Transcript"
Included script to convert mapping files into GFF3 loader recognized format.
Loader recognizes and adds gene, mrna, and cds record types but includes duplicates.