begin implementing landing page for guests
refactor css into sass variables, fix lightbox image box-shadow
move sass variables to base file, continue refactoring
Merge branch 'nick' into guest-landing
add header with bgimage
move landing css to posts.css, only include the partial if the user is not logged in
merge fixed header
fix img bug, no inline images all bg-image directive
Merge branch 'nick' into guest-landing
merge hashtag show views
Merge branch 'nick' into guest-landing
minor header nav fixes