Duplicating JS webpack config for karma

This remove the implicit dependency on bourbon for running the karma
tests

karma.conf.js

@@ -1,5 +1,3 @@
-var webpack = require('./webpack.config.js');
-
 module.exports = function(karma) {
   karma.set({
     frameworks: ['jasmine'],
@@ -15,7 +13,23 @@ module.exports = function(karma) {
     singleRun: false,
     webpack: {
       devtool: 'inline-source-map',
-      module: webpack.module
+      module: {
+        loaders: [
+          {
+            test: /\.js$/,
+            exclude: /node_modules/,
+            loader: 'babel'
+          },
+          {
+            test: require.resolve('snapsvg'),
+            loader: 'imports-loader?this=>window,fix=>module.exports=0'
+          },
+          {
+            test: /\.peg$/,
+            loader: require.resolve('./lib/canopy-loader')
+          }
+        ]
+      }
     }
   });
 };