BigWig displaying from BAM file.
BAM coverage loading from refs, VCF variant tracks displayed in data selector.
Merged and resolved conflicts.
Chunk size.
Increased chunk size, deleted obsolete controller.
Exposed API throught genBrowserOptions instead of referencing parent scope.
Async bug fix.
Window size can be set to fixed amount.
JBrowse ID fix.
Cleanup.
Merge pull request #7 from usoban/feature-big-wig

Display BigWig coverage along with BAM track and various fixes.