[Users] Configuration File

[Dan Ramage]

Since the maps I've been working on are mostly the same GUI but just
different layers and map areas, I've started working on a JSON configuration
file. I thought having some base map code that pulls in its configuration
would speed things up for me. Looks like using the ExtJS JSON Reader would
be the way to go, and I see GeoExt implements a FeatureStore, so I thought
maybe someone had implemented something similar for the initial map setup.

Dan