add applications support
Merge branch 'master' into add_applications
add example app
add support for authorized connect apps
rename JSONPrice to JSONFloat
add AvailablePhoneNumbers endpoints

https://www.twilio.com/docs/api/rest/available-phone-numbers
update Roadmap

cc @chelpu & @jmatth, I think feature complete is actually possible
Merge pull request #36 from natebrennand/add_available_phone_numbers

Add available phone numbers