Merge pull request #209 from mapbox/cm4

Update to the latest version of Codemirror
merge
fix header
easier settings escape
bring back pane for display none purposes
fix issue with data list
Merge pull request #218 from mapbox/settings-change

Settings change
add pane class to fonts pane
hide package btn until map is saved
fix selector
remove z-index from pane
fix travis break
Merge branch 'master' of https://github.com/mapbox/tm2
fix visibility issues
fix zoom control toggle.
fix html error
Merge branch 'master' into swatches
2nd ring to the palette swatch