changes support banner ads.
modified copy and logo for banner ad
added missing image file
Made 'presents' logo the default and linked logo in 'ad' version
Replaced straight quote with smart quote
Added Visual Website Optimizer script for a/b testing
added a small amount of SEO by changing p tags to h tags, Also cleaned up css styles.
Fixed broken Content-Type header
Merge branch 'phill' into 'dev'
Fixed sh.js so it displays shell commands' output
Cache-busted CSS