Add MessageSender

textsecure.MessageSender takes server url and credentials and returns
a message sending interface configured for that server.

Used a wrapper function to insert a TextSecureServer instance into
sendmessage.js code at runtime. This will result in function duplication
between different MessageSender objects, pending further refactoring to
use prototypal inheritence.

// FREEBIE

js/background.js

@@ -102,6 +102,7 @@
 
         messageReceiver.addEventListener('contactsync', onContactSyncComplete);
 
+        window.textsecure.messaging = new textsecure.MessageSender(SERVER_URL, USERNAME, PASSWORD);
         if (firstRun === true && textsecure.storage.user.getDeviceId() != '1') {
             textsecure.messaging.sendRequestContactSyncMessage().then(function() {
                 textsecure.messaging.sendRequestGroupSyncMessage();

js/libtextsecure.js

@@ -39586,7 +39586,10 @@ var TextSecureServer = (function() {
  * vim: ts=4:sw=4:expandtab
  */
 // sendMessage(numbers = [], message = PushMessageContentProto, callback(success/failure map))
-window.textsecure.messaging = function() {
+window.textsecure.MessageSender = function(url, username, password) {
+     'use strict';
+    var server = new TextSecureServer(url, username, password);
+    return (function(TextSecureServer) {
         'use strict';
 
         var self = {};
@@ -40020,7 +40023,8 @@ window.textsecure.messaging = function() {
         }
 
         return self;
-}();
+    })(server);
+};
 
 /*
  * vim: ts=4:sw=4:expandtab

libtextsecure/sendmessage.js

@@ -2,7 +2,10 @@
  * vim: ts=4:sw=4:expandtab
  */
 // sendMessage(numbers = [], message = PushMessageContentProto, callback(success/failure map))
-window.textsecure.messaging = function() {
+window.textsecure.MessageSender = function(url, username, password) {
+     'use strict';
+    var server = new TextSecureServer(url, username, password);
+    return (function(TextSecureServer) {
         'use strict';
 
         var self = {};
@@ -436,4 +439,5 @@ window.textsecure.messaging = function() {
         }
 
         return self;
-}();
+    })(server);
+};