Add Google Analytics

(Reopening since my other PR got closed during cleanup.) 

Added Google Analytics, added tracking to the individual views (wherever TestFight was logging, basically; 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.) 

The dispatch time is set to GA's recommendation of 120 seconds. I did not implement the opt-out functionality since we're not collecting anything new (besides button taps); however, we can discuss creating an option for this in the future across platforms.