Simplify wording
Put a disabled select in for now
Explain heroku redirect. Remove step 4
Remove name attr and add dummy option
Add anchor to heroku.com
Correct grammar
Shorten intro
Remove confusing text about inputs
Expanded code comments throughout
Accounting for Google login response in output
Broke callback_google() into get_google_personal_info() and get_google_analytics_properties()
Accounting for zero properties in Google list response in output