remove the presets from karma.conf.js

as it seems to pick them up from .babelrc

karma.conf.js

@@ -131,13 +131,7 @@ module.exports = function (config) {
                         test: /\.js$/, loader: "babel",
                         include: [path.resolve('./src'),
                                   path.resolve('./test'),
-                                 ],
+                                 ]
-                        query: {
-                            // we're using react 5, for consistency with
-                            // the release build, which doesn't use the
-                            // presets.
-                            // presets: ['react', 'es2015'],
-                        },
                     },
                 ],
                 noParse: [