Added a few features

I've found a few features quite helpful while working with grunt-dss. I figured I'd share them for discussion:

- Added file name without the path for templates. Useful when you want to display files as headings.
- Added option to set location of generated docs.
- Added folder information for templates. Useful for when you're creating documentation for a complicated file structure and want to link between the documentation for each folder.
- Added option to send the location of compiled CSS. This is useful if you use a preprocessor or if you use iframes to render the examples with the generated CSS.