remove require.context from network_bundle

app/assets/javascripts/network/network_bundle.js

@@ -2,9 +2,8 @@
 /* global Network */
 /* global ShortcutsNetwork */
-// require everything else in this directory
-function requireAll(context) { return context.keys().map(context); }
-requireAll(require.context('.', false, /^\.\/(?!network_bundle).*\.(js|es6)$/));
+require('./branch_graph');
+require('./network');
 (function() {
   $(function() {