DyKnow/SignalR-ObjC — pull request #57 by abillingsley (2012-02-23 23:02:21+00:00)
Title: Make JSON Library Pluggable

Removes the direct dependency on SBJSON (json-framework) and instead moves to NSJSONSerialization provided by apple. As part of this transition, this also provides "automatic support" for many of the other popular json frameworks available.

### Supported JSON Libraries (shown in fallback order)
* JSONKit
* SBJSON
* YAJL
* NSJSONSerialization

#### Custom Objects should implement at least one of the following interfaces:
* proxyForJSON from SBJSON
* JSON from YAJL
* pass `NSJSONSerialization` `+ (BOOL)isValidJSONObject:(id)obj`