More wiki updates

Hi,

I recently wrote a quick start, https://github.com/AnalyticalGraphicsInc/cesium/wiki/Quick-Start, that concisely describes how to build and run Cesium, and I started a code review tips page, https://github.com/AnalyticalGraphicsInc/cesium/wiki/Code-Review-Tips. The later will be flushed out as we continue to learn.

Soon I’ll also add a feature list to the wiki and the CZML Contributor’s Guide that I promised so long ago.

Regards,

Patrick