Added the ability to show a blank map for a new location, and fixed various other display issues with the map.

Also refactored a bit to make it more readable.
Added a way to update the address by geolocation in the admin.

And removed the ability to do that from the mobile app.
Fixed issue where the marker wouldn't appear after selecting an address IF the was no initial location when the page loaded.
Removed the map darkening.
Added the model and migration for adding "Additional Details" sections to each meal location.
Added django-grappelli.
Made the "Additional Details" sections draggable/orderable.