Update CITATION

Adding publisher's address to book citation.
Create bw.css

Adding black & white style file. Comments are italics and function names bold.
Adding more variations of the  B & W theme.
Changing to address to BOCO'
Changing to address to BOCA'
Merge branch 'master' of github.com:csgillespie/knitr
Merge pull request #679 from csgillespie/master

Update CITATION