Handle touch gestures while menu is open.
<!-- Menu -->
<div class="menu" ng-class="{open: menu.shown}" id="guac-menu">
- <div class="menu-content" ng-if="menu.shown">
+ <div class="menu-content" ng-if="menu.shown" guac-touch-drag="menuDrag">
<!-- Stationary header -->
<div class="header">
