URLs-fix

"Normal" express-routers can be used in parallel with fastload.js.

Before:
I was able to reach http://host:port/l/imgurl (my fastload url), but I was unable to reach http://host:port/otherurl (any other express url) when fastload was in use by express.
The error was on the line 56: Cannot read property length of undefined

Now:
I'm able to reach http://host:port/l/imgurl and http://host:port/otherurl on the same time.