Fix rendering of note comments (#333)
Replace `:nothing => true` with `:text => ""`

Using `:nothing => true` confusingly actually causes a single space
to be sent as the content by rails.
Merge remote-tracking branch 'osmlab/map-ui'
Don't try and look at params.layers when it isn't set
Increase width of coordinate fields in export panel
Pass correct arguments to updatelink
Reorganize share/export UI

"Image" and "Embeddable HTML" options move to share control.
Only XML export remains, and is now accessed via a sidebar
link rather than the tab bar.
Add option to include marker in permalinks
Link to sources for bulk downloads