updated docu
- fixed detection of AS-only scenarios
- removed unused method from interface
enhanced flexibility for specifying file name

Detected postfixes of filenames are automatically removed. Avoids
problems with specifying the file names via the GUI. User does not need
to know that he/she has to remove the postfix on her/his own.
fixed null pointer exception if no link weight transformer specified
Merge branch 'master' of https://github.com/ICS-TU-Ilmenau/fog.git