Add Google Analytics

(Reopening since my other got closed during cleanup.) 

Added Google Analytics, added tracking to the individual views (wherever TestFight was added; also, I moved the TestFlight log from ```viewDidDisappear``` to ```viewDidLoad``` whenever I saw it, because I wasn't getting GA to track when it was in ```viewDidDisappear```. Not sure if this caused any TestFlight issues, but wanted to be consistent). 

Also added to certain actions, like clicking the StopInfo button, turning on Experimental regions, and clicking the E-Mail, Twitter, Facebook, Feature Request, or Privacy Policy links, etc. Tested as thoroughly as I could with my own device, everything is coming up fine-- although it doesn't show me the API Region when the app resigns active. Or at least I haven't found it in the GA log. I don't think this is big enough to look into for now, as we have location data. (I also log when they set their region.)