Update to iD v1.4.0

* Ensure combobox menus are closed on blur (#2207)
* Limit imagery_used tag to 255 characters (#2181)
* Simplify and fix midpoint drawing logic (#2136)
* Prefer more specific 'Crosswalk' preset over generic 'Crossing'
* Add amenity=dojo preset
* Correctly trim whitespace in semicolon-separated multivalues (#2236)
* oneway fields now show "Assumed to be No" or "Assumed to be Yes" instead of "Unknown" (#2220)
* Add turn restriction editor