GoogleTokenProvider
Library for accessing google API.
Library is an addition to SwiftConnection library.
Credential file should be in format:
{
"client_id": "some_client_id",
"authorize_url": "https://accounts.google.com/o/oauth2/auth",
"token_url": "https://oauth2.googleapis.com/token",
"client_secret": "client_secret",
"callback": "/google/callback"
}