Replace followInsecureSymbolicLinks with followInsecureSymlinks.

I was using "npm link" inside a montagejs application but symlinks files were not served event with the -i flag.
By replacing followInsecureSymbolicLinks with followInsecureSymlinks, the -i option works.
(at line 55 of node_modules/q-io/http-apps/fs.js the option name is followInsecureSymlinks)