[TYPO3-caretaker] CheckPathService

[Felix Oertel]

Hi,

I just made my first committ and built a CheckPathService. Somehow my 
SVN client ate the "-F committ.msg", so here is, what I committed:

* added CheckPathExists-Operation to test if a specified path exists
* added CheckPathTestService to test if one or more paths exists or do 
not exist and are the right type (file/folder)

Just have a look inside the test-section, I think it's pretty 
self-explaining.

If you have questions, feel free to email me. ;-)

Regards, Felix