make JBrowse/Util/GFF3 for low-level GFF3 routines
WIP on new gff3 parser
gff3 parser working fairly well
turn gff3 parser into a push parser instead of a pull parser
wip on new gff3 store
bugfixes to GFF3 parsing
new GFF3 store implementation working
gff3 store getting closer to correct
gff3 store getting closer
add failing test for unicode chars in gff3
make FileBlob line-getting properly decode UTF-8
add gff3 rewrite to release notes
Merge branch 'gff3' into maint/1.9.x

Conflicts:
	release-notes.txt