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
Fix typo in instance info endpoint
Make eco default units "per year"

kwh -> kwh/year
gal -> gal/year
Give roof polygon point markers a higher Z offset than plot marker
Merge pull request #1296 from RickMohr/eco-units

Make eco default units "per year"
Merge pull request #1297 from RickMohr/update-leaflet-editable-polyline

Give roof polygon point markers a higher Z offset than plot marker
Allow overriding the center location of an instance
Merge pull request #1294 from OpenTreeMap/topic/all-center-overrides

Allow overriding the center location of an instance
Change the API return schema for instance eco

Previously, eco benefits were returned with a plot as an array. Mobile
applications only needed to know the number of eco fields that would be
included. Now, the eco fields for a plot are returned as a dictionary,
so the instance API must return the keys needed to read from the
dictionary and the order in which those keys should be displayed. I
copied the key ordering from the current web app UI.
Update Co2 stored label

Requested in https://github.com/OpenTreeMap/OpenTreeMap-iOS/issues/129
Remove background tree photo, but add it to base.scss for future work
Merge pull request #1299 from jwalgran/topic/co2-stored-label-update

Update Co2 stored label
Merge pull request #1300 from mtedeschi/fix/70/remove-background-photo

Remove background tree photo
Merge pull request #1298 from jwalgran/topic/api-eco-schema-update

Change the API return schema for instance eco
Remove background tree photo, but add it to base.scss for future work
Merge branch 'release' of github.com:OpenTreeMap/OTM2 into release
Merge pull request #1293 from maurizi/release

Fix typo in instance info endpoint
Fix typo in instance info endpoint
Revert change from PR #1293

This was not a typo. It is a dictionary comprehension.
Merge pull request #1292 from RickMohr/update-leaflet-editable-polyline

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