Merged.
Resolved conflict in static/genapp-jbrowse/app/directives.js
Resolved conflict.
Show BigWig gene expression coverage track for expression files.
Showing VCF files in data selector.
Reformatting
Merge pull request #11 from usoban/feature-expr-coverage

Show BigWig when expression file selected
Merge pull request #12 from usoban/feature-vcf-track-selection

Showing VCF files in data selector.