Beginning work creating tracks that are set-theoretic combinations of other tracks
Very preliminary work on Combination Tracks
Creating combination track, which holds set theoretic combinations of other tracks using a drag-and-drop interface
Added context menu to combination track and made prettier
Added menu options to combination track and made prettier
Merge branch 'combination_track' of https://github.com/GMOD/jbrowse into combination_track
Continuing work on combination tracks
Continuing work on combination track.  Store now creates features which are shown by the track.  Needs fix.
Fixed the data displayed by the combination track
Modified combination track to only load store once
Continued work on combination track
Beginning work to allow dragging and dropping inner tracks OUT of the combination track
Enabled dragging inner track out of combination track
Stopped hard-coding combination tracks and moved to a new 'Tracks' menu; changed function of the 'close' button of inner track
Fixed drag-and-drop glitchiness of combination tracks and added globalStats
Modify combination track to use dojo/on
Fixed glitches and began adding support for BigWig-like quantitative data combination tracks
Fixed glitches and redesigned combination track context menu with more flexibility
Disabled dragging unsupported tracks into combination track
Began combining masking and combination track functionality