fixed the wording for the text messaging

Author: rastalamm

server/services/message_service.js

@@ -10,6 +10,6 @@ module.exports = {
   '6' : '@vtext.com',
   '7' : '@vmobl.com',
   subject: 'SnapDown Challenge Invitation',
-  messageBody: 'invited you to a challenge'
+  messageBody: 'invited you to a challenge. Open your SnapDown app to play!'
 };