Proxy refactor

Removed proxy flag and localized proxy functions into corsProxy.js.

At startup bother server.js and ausglobeviewer get proxy list from public/config.js
IE9 check in ausglobeviewer and corsProxy list added.
Proxy flag removed from init_nm and GeoDataCollection

I think I caught everything but worth some heavy local usage before deploying.
Don't we need all these query parameters?  After this change, Surface Water -> Bores looks like this:
![image](https://cloud.githubusercontent.com/assets/924374/3619067/d6e68222-0df0-11e4-980d-1609720baaef.png)

We should either add back the query parameters, or remove the claim that the link is sending you right to GeoJSON data.