Adding Google Analytics to newproject and tarbell_config.py

I've already updated the 0.9b5 branch of tarbell-template to use the new GOOGLE_ANALYTICS_ID that this system generates. The Trib template hardcodes a GA ID because we use the same one for all Tarbell projects, not sure if we should change that or not. It'd be nice if we could prompt users with the default and let them customize it if they want, but not sure if that's possible currently.