Use leaflet-editable-polyline.js from Azavea github repo

* All changes to date installed in github:Azavea/leaflet-editable-polyline
* Merged with changes from source repo (github:tkrajina/leaflet-editable-polyline)
* Unix line endings instead of Windows line endings
Give roof polygon point markers a higher Z offset than plot marker
Merge pull request #1292 from RickMohr/update-leaflet-editable-polyline

Use leaflet-editable-polyline.js from Azavea github repo