Incorporate @quepol responsive changes and Google Analytics code

Merge branch 'dev'
Switch to 18fblog.tumblr.com

Merge branch 'dev'
Merge pull request #1 from 18F/dev

added photos to index.html
Merge slideshow transitions and content updates

Merge branch 'dev'
Max height for blog posts

Merge branch 'dev'
Updated tagline

Merge branch 'dev'
Tweak some language in the comments