placeholder markup
fixed syntax errors in layout value
Adds reference to new header bg images
new header bg image
Adds reference to new header bg images
extracts site-nav out into an partial
background position correction for some header images
Ads 404 page
Moved WIP callout to a footer p; sets anchor color globally; creates mixin for serif
Merge pull request #29 from jglovier/dev-404

Creates 404 page