Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/underscore/modules/bindAll.js

@@ -0,0 +1,17 @@
+import restArguments from './restArguments.js';
+import flatten from './_flatten.js';
+import bind from './bind.js';
+
+// Bind a number of an object's methods to that object. Remaining arguments
+// are the method names to be bound. Useful for ensuring that all callbacks
+// defined on an object belong to it.
+export default restArguments(function(obj, keys) {
+  keys = flatten(keys, false, false);
+  var index = keys.length;
+  if (index < 1) throw new Error('bindAll must be passed function names');
+  while (index--) {
+    var key = keys[index];
+    obj[key] = bind(obj[key], obj);
+  }
+  return obj;
+});