* dont let refresh attempt bust API

ruby/lib/jam_ruby/models/user_authorization.rb

@@ -20,6 +20,7 @@ module JamRuby
       # if we have an auth that will expire in less than 10 minutes
       if auth && auth.refresh_token && auth.token_expiration < Time.now - 60 * 10
 
+        begin
         oauth_client = OAuth2::Client.new(
             Rails.application.config.google_client_id, Rails.application.config.google_secret,
             :site => "https://accounts.google.com",
@@ -27,8 +28,12 @@ module JamRuby
             :authorize_url => "/o/oauth2/auth")
         access_token = OAuth2::AccessToken.from_hash(oauth_client, {:refresh_token => auth.refresh_token})
         access_token = access_token.refresh!
+        rescue Exception => e
+          # couldn't refresh; probably the user has revoked the app's rights
+          nil
+        end
+
         auth.token = access_token.token
-        puts "access_token #{Time.now + access_token.expires_in} #{access_token.expires_in}"
         auth.token_expiration = Time.now + access_token.expires_in
         auth.save
         auth