chore(docs): don't rewrite colons in doc filenames

lib/nodeserver/server.js

@@ -109,9 +109,6 @@ StaticServlet.prototype.handleRequest = function(req, res) {
       sys.puts('Rewrite to ' + path);
   }
 
-  // rewrite : to _ to be GAE-friendly
-  path = path.replace(':', '_');
-
   // end of docs rewriting
 
   fs.stat(path, function(err, stat) {