added code, icons and css for sign and verify message

src/js/services/signVerifyMessageService.js

@@ -0,0 +1,37 @@
+'use strict';
+angular.module('copayApp.services').factory('signVerifyMessageService', function($http, $log, lodash, moment, storageService, configService, platformInfo, servicesService) {
+  var root = {};
+  var credentials = {};
+
+  var signServicesItem = {
+    name: 'signMessage',
+    title: 'Sign Message',
+    icon: 'icon-sign-message',
+    sref: 'tabs.signMessage',
+  };
+
+  /*var verifyServicesItem = {
+    name: 'verifyMessage',
+    title: 'Verify Message',
+    icon: 'icon-verify-message',
+    sref: 'tabs.verifyMessage',
+  };*/
+
+  var register = function() {
+    servicesService.register(signServicesItem);
+    //servicesService.register(verifyServicesItem);
+  };
+
+  root.signMessage = function(wallet, message) {
+    var privKey = wallet.credentials.walletPrivKey;
+    var coin = wallet.coin;
+    return wallet.signMessage(message, privKey, coin);
+  }
+
+  root.verifyMessage = function(message, signature, pubKey, coin) {
+    return wallet.verifyMessage(message, signature, pubKey, coin);
+  }
+
+  register();
+  return root;
+});