Merge pull request #1 from aditshankar/master

Screenshot + Copy Changes
Merge pull request #2 from aditshankar/master

Better edges on the mac image
Merge pull request #3 from aditshankar/master

By popular demand, logo in white :)
added signup via mixpanel
added google analytics
added ack of buffer
added wercker
updated wercker
fixes
track viewed sections
Merge pull request #4 from aditshankar/master

2x images and replacement for the app-1 image
added detailed google analytics
cleared retina images
Merge remote-tracking branch 'upstream/master'
handled screenshots in mobile view