Added alias for new ReactMount location -- #73 (#74)

This is a temporary fix for ReactMount being moved to react-dom in 15.4+. For a long-term solution that involves updating to RHL3 please follow the relevant issue/PR.

Author: sthzg

cfg/base.js

@@ -35,7 +35,8 @@ module.exports = {
       sources: `${defaultSettings.srcPath}/sources/`,
       stores: `${defaultSettings.srcPath}/stores/`,
       styles: `${defaultSettings.srcPath}/styles/`,
-      config: `${defaultSettings.srcPath}/config/` + process.env.REACT_WEBPACK_ENV
+      config: `${defaultSettings.srcPath}/config/` + process.env.REACT_WEBPACK_ENV,
+      'react/lib/ReactMount': 'react-dom/lib/ReactMount'
     }
   },
   module: {}