Merge pull request #7 from bpruitt-goddard/PresentationCleanup

Rename Pragmatic post to avoid conflict with repo
Prepend blog URLs with /posts

Having the URLs directly off the base results in conflicts with other GitHub Pages repositories.
Update _config.yml

Try again with year/month/day
Update Pragmatic Programmer Post

Final fix to correct slideshow URL
Update to latest Jekyll version
Add basic about page
Widen content area to improve readability