Removed times from posts and made minor edits

+ Removed times from posts since I only show the date
+ Modified content/2013/pelican-setup.md and content/2013/swc-wise.md to use
  ---- style H2 header instead of ## style
+ Minor edits to content/2013/pelican-demo.md and content/2013/pelican-setup.md
  to reference each other
+ Modified content/pages/about.md to use @ in signature