fix syntax

this is a follow up to #124,

this changes the behaviour as follows:
```\lstinlie``` behaves like ```\verb```
and ```\lstinputlisting``` behaves as any other file input would. I think this makes much more sense and also the ```lstinputlisting``` was broken if any makro was used within the argument of it, like ```\lstinputlisting{\MyPath/foo.bar}```. Which would result in "verbatim" syntax until the next normal latex-makro.