Update style.css

named this CSS sheet as: "Donham EPUB"
Update style.css

- added CSS header with Name/PressBooks info etc.
- named sheet "Donham PDF" ... 
- incorporated PrinceXML documentation link in header.
Update style.css

- renamed "donham web"
Update style.css

added more metadata to CSS sheet in header.
Update style.css

added header metadata.
Update style.css

- named Clark EPUB in the metadata
Merge pull request #22 from hughmcguire/dev

Dev