add global site.url and move social stuff out of the header and into an include
template specific footer with social sharing text. closes #10
social data and page-specific titles in the nav. closes #11
Merge branch 'master' of github.com:nclud/sketchbook

# By Kyle Conrad
# Via Kyle Conrad
* 'master' of github.com:nclud/sketchbook:
  Adding animation video & screen to design section for mobile phone devices