Different separator for file and folder renaming

Hi

since I'm using a different naming scheme for my files and folders I have implemented the ability to change the file and folder renaming separator separately.

This is how I'm using it
![Example of separate file and folder separator](http://f.cl.ly/items/020W3f19111u121z2j45/Screen%20Shot%202013-09-19%20at%2008.08.18.png)

I thought it could be useful to others too.

Cheers
Alex