[Cosmo-dev] Web UI configuration system

[Travis Vachon]

Hi folks

Our procedure for handling administrator configurable values in the  
web ui has been a minor problem for a few months. Pre-custom dojo  
build we simply stored these values in src/main/webapp/js/cosmo/ui/ 
conf.js, but the build process packs and compresses this file like  
all the other javascript, making it useless to administrators.

To fix this I've added src/main/webapp/webui.conf. This file contains  
a JSON mapping of configuration keys to values. When cosmo.ui.conf is  
loaded we fetch this file and mix the values defined there into  
cosmo.ui.conf.

cosmo/ui/conf.js still contains the old configuration system, which  
is used in quite a bit of code. We might want to think about ways to  
phase this out after preview, but they are peacefully coexisting for  
now!

-Travis