Added dkasenberg/FileSaver as a submodule, forked from eligrey.  Will allow ability to specify filename when saving tracks
Modifying track download to allow user to select filename
Altered View/Track/ExportMixin.js to allow user to enter filename for track's saved data
Added filename textbox to Export View window
remove unnecessary use of appendChild, fix some whitespace and reserved word errors
add save-generated-files to JBrowse/has, use it in Export feature sniffing.  also add `noExportFiles` config var
replace export View dialog filename textbox with a dijit textbox, looks better in that context.  also associate it graphically with the save button
factor export view-dialog code into a separate method, trying to trim this nasty thatch of code a bit
add save filename to the release notes
Merge branch 'savetrack_filename' into maint/1.9.x

Conflicts:
	release-notes.txt