Prevent possible security exploit

While doing development on Respect/Loader a massive security vulnerability was discovered which has the possibility to have huge repercussions as it gives any include file scope to hijack the autoloader.
see Respect/Loader#6 for more information.

This fix will also prevent an included script from auto-outputting anything as a result from the include call which will prevent any unwanted source code from ever being revealed as a result of faulty tags or phising for information when a script manages to be included by someone trying to exploit the application.