Use babel 5 for karma tests

karma.conf.js

@@ -99,7 +99,10 @@ module.exports = function (config) {
                                   path.resolve('./test'),
                                  ],
                         query: {
-                            presets: ['react', 'es2015']
+                            // we're using react 5, for consistency with
+                            // the release build, which doesn't use the
+                            // presets.
+                            // presets: ['react', 'es2015'],
                         },
                     },
                 ],

package.json

@@ -40,13 +40,15 @@
     "velocity-animate": "^1.2.3",
     "velocity-ui-pack": "^1.2.2"
   },
+  "//babelversion": [
+      "brief experiments with babel6 seems to show that it generates source ",
+      "maps which confuse chrome and make setting breakpoints tricky. So ",
+      "let's stick with v5 for now."
+  ],
   "devDependencies": {
     "babel": "^5.8.23",
-    "babel-core": "^6.7.4",
-    "babel-loader": "^6.2.4",
-    "babel-preset-es2015": "^6.6.0",
-    "babel-preset-react": "^6.5.0",
-    "babel-runtime": "^6.6.1",
+    "babel-core": "^5.8.38",
+    "babel-loader": "^5.4.0",
     "expect": "^1.16.0",
     "json-loader": "^0.5.3",
     "karma": "^0.13.22",