Build a responsive, one-page, landing page.

see:
https://trello.com/card/build-a-responsive-one-page-landing-page/51d35afb4e1b305176001b5e/5
Build a responsive, one-page, landing page.

see:
https://trello.com/card/build-a-responsive-one-page-landing-page/51d35afb4e1b305176001b5e/5
Merge remote-tracking branch 'origin/master'