Run Braintree Data specs in Braintree Data Demo App test host
Fix BTData location behavior
Remove side-effecty BTData test
Update BTData API to include a collectDeviceData which returns device data in same format as Braintree-Data.js (JSON)
Add environment chooser menu to dev demo app
Improve version bump script to pass full tag version into code
Move Braintree Version header in xcode project
Persist most recently used environment in dev demo app to NSUserDefaults
Automatically fetch a client token when the dev demo app launches