Integrate lovely plot marker graphics
Merge pull request #484 from maurizi/fix/addTreeUpdatesCount

Update Eco-Benefits when adding a tree, other minor fixes
Expose STATIC_URL via settings.js, and use it for plot marker PNG's
Merge pull request #493 from RickMohr/fancy-plot-marker

Integrate lovely plot marker graphics
Make button disabling work right

Two related pieces:
1) Expose inlineEditForm.enableOrDisableEditButton() so the map page can call it when you click on a tree
2) Change all of our <a class="btn"> to <button class="btn"> so they can be easily disabled. Bootstrap displays them identically.
Merge pull request #494 from RickMohr/fix-button-disabling

Fix button disabling
Pass config to plotMarker.init()
Fix using create tag with required foreign key fields
Add usercancreate template tag
Don't serialize unchanged fields.
Add ability to add trees to plots from the plot detail, Fixes #436