refs #741: better save dialogs
simplify save extension lookups
Merge branch 'mb-pages' into better-save-dialog
[publish better-save-dialog]
add tracking in segment.io for current version
identify version instead of track
move version track into analytics.html
get version once
Merge pull request #846 from mapbox/version-track

Track app version in analytics
simplify usage of dark class
Merge pull request #852 from mapbox/dark-map-cleanup

simplify usage of dark class
Merge pull request #848 from mapbox/refreshquest

refreshquest pt. 1
add filter for file extension, works on win!
Merge branch 'mb-pages' into better-save-dialog
Merge pull request #743 from mapbox/better-save-dialog

refs #741: better save dialogs
Invalidate local sources on refresh.
Merge remote-tracking branch 'origin/source-invalidate-on-refresh' into refreshquest-part2