add toggle for email notifications

src/js/services/configService.js

@@ -85,6 +85,10 @@ angular.module('copayApp.services').factory('configService', function(storageSer
         windows: {},
       }
     },
+
+    emailNotifications: {
+      enabled: true,
+    },
   };
 
   var configCache = null;

src/js/services/emailService.js

@@ -0,0 +1,36 @@
+'use strict';
+
+angular.module('copayApp.services').factory('emailService', function($log, configService, profileService, lodash, walletService) {
+  var root = {};
+
+  root.enableEmailNotifications = function(val) {
+    val = val || false;
+
+    var config = configService.getSync();
+
+    if (!config.emailFor) {
+      $log.debug('No email configuration available');
+      return;
+    }
+
+    var keys = lodash.keys(config.emailFor);
+    var wallets = lodash.map(keys, function(k) {
+      return profileService.getWallet(k);
+    });
+
+    if (!wallets) {
+      $log.debug('No wallets found');
+      return;
+    }
+
+    lodash.each(wallets, function(w) {
+      walletService.updateRemotePreferences(w, {
+        email: val ? config.emailFor[w.credentials.walletId] : null
+      }, function(err) {
+        if (err) $log.warn(err);
+      });
+    });
+  };
+
+  return root;
+});