move gff3 strand fix from GFF3 parser into GFF3 store, want parser to emit exactly what's in the file
refactor BigWig/RequestWorker preparing to work on #312
rewrite BigWig/RequestWorker to be non-recursive, references #312
improve bigwig performance
further improve BigWig performance, references #312
update release notes, closes #312
add MYMETA.* to gitignore
bugfix to new bigwig code
fix compact display mode layout bug
prevent box glyphs from getting shorter than their arrowheads if arrowheads are active
fix some more small "compact" layout bugs
fix small bug with text alignment of mismatch base text
bugfix to detailsmixin.js
make locally-opened BigWig tracks default to local autoscaling, fixes #319
fix `defaultTracks` conf being overridden in index.html
Merge branch 'master' into arrowheads_2

Conflicts:
	src/JBrowse/View/Track/CanvasFeatures.js
Merge branch 'arrowheads_2' of github.com:GMOD/jbrowse into arrowheads_2