[BUGFIX] AutoloaderAspect cleanup and fixes

fix: failed when no before aspect is configured
fix: referenced variables in aspected method-head
new: Example for templavoila preview for contentobjects
fix: exception when create a aspect for not avaible classes and methods

Change-Id: I283ea822d88e26c38bee52df0f80422e03b19542
Reviewed-on: http://review.typo3.org/34353
Reviewed-by: Carsten Biebricher <cb@hdnet.de>
Tested-by: Carsten Biebricher <cb@hdnet.de>