Update links to Karthik Ram at GitHub
Add link to knitr tutorial
Small changes to Why? page
Small change on front page
A bunch of small changes
Fix formatting problems in pages/fork.md
Minor changes to exploring_code.md and rstudio.md
README -> ReadMe; kramdown in _config.yml

 - Also, add License.md to excludes in _config.yml
Add link to simple_site
Simpler code elements - not red and no box
Simpler code elements - not red and no box
Reduce code element font size
css: code within links also highlighted
Revise link to Twitter Bootstrap
Remove target=_blank from default.html
Add link to Kevin Markham's videos about git/github
Fixed broken link to minimal make tutorial
Merge pull request #1 from seankross/gh-pages

thanks for the fix!
Merge commit '63ecd3bfeb551022c04f6b0a4d09eed81b85de26'