feat(uac): add multi user management and UAC (#647)

app/services/endpointProvider.js

@@ -0,0 +1,23 @@
+angular.module('portainer.services')
+.factory('EndpointProvider', ['LocalStorage', function EndpointProviderFactory(LocalStorage) {
+  'use strict';
+  var endpoint = {};
+  var service = {};
+  service.initialize = function() {
+    var endpointID = LocalStorage.getEndpointID();
+    if (endpointID) {
+      endpoint.ID = endpointID;
+    }
+  };
+  service.clean = function() {
+    endpoint = {};
+  };
+  service.endpointID = function() {
+    return endpoint.ID;
+  };
+  service.setEndpointID = function(id) {
+    endpoint.ID = id;
+    LocalStorage.storeEndpointID(id);
+  };
+  return service;
+}]);