Adds map layers to map edit form

Create new map form allowed you to add layers, but the edit for did not. So, I made the edit form based off of the create form. 

This has the possibility of effecting map create & map update urls such as the following patterns:
maps/update/<pk>
ex: maps/update/2
maps/create/ 

Please let me know if you have questions.

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*addition*
+ Resolving minor AOI workflow issues documented here:
https://github.com/presidential-innovation-fellows/geoq/pull/1

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*addition*

Commits: 0ddfad8, da8c50d15, 383eddb
+ Resolving - Update layer logic to use current viewspace in queries
https://github.com/presidential-innovation-fellows/geoq/pull/2