run es6 tests in karma

tests.webpack.js

@@ -0,0 +1,14 @@
+// Require babel polyfill for browser.
+require('babel-polyfill');
+
+var testsContext = require.context('./spec', true, /\.test\.js$/);
+testsContext.keys().forEach(testsContext);
+
+require('./client/models/house');
+require('./shared/utils/date_range');
+
+/*
+var srcContext = require.context('./client', true, /\.js$/);
+srcContext.keys().forEach(srcContext);*/
+
+