added plantings, seeds, and harvests to the crops JSON
Add map, move info to sidebar
Tweak what's emitted as JSON

(let's just emit plantings for now, as that's all we're using)
Display crop plantings on a map
Reduced cluster radius for maps

on both crops and places pages

Did this because the clusters were annoyingly over-general, eg. showing
164 people in the eastern part of North America.  Cluster radius of 20px
is about the radius of the cluster icon itself.  Seems to work better
eg. for separating Melbourne from Sydney on the world map.
rearranged crop page headings and added tests
remove 1px wide black line on borders
update the navbar and footer to more modern design and colors
fix centering on top nav
Merge pull request #362 from Skud/navbar-visual-tweaks

Navbar visual tweaks
Merge pull request #361 from Skud/crop-map

Crop map
renamed div#map to #cropmap on crop page

this prevents confusion when assets are compiled (i.e. it worked in dev
but not on staging; this fixes the problem.)
Merge pull request #363 from Skud/crop-map2

fixed error with crop map on staging
Rename map on /places to #placesmap

The way the javascript is compiled means it's a good idea to make sure
everything is as distinct as possible.
small refactoring to clean up js
check that map exists on page before drawing it
fixed tests to pass with new map div ids
Changed headings on places maps to match new menu ('Community map')
Fixed bug with specific place map

(it was still referring to div#map not #placesmap)

also changed the headings a bit on that page
Merge pull request #364 from Skud/crop-map3

Finally got crop maps AND community map working