Upgrade to Rails 4
Fix width of hero unit on Contact page

To do this, adjust the application layout to not include the base container so that in the Contact
view, we can make sure that the hero unit is outside of that container.
Remove unnecessary pages
Add Mission page
Change hero unit text color to white
Add Spotlight page
Remove the footer's stickiness

By removing the sticky footer, the footer now displays a lot higher on the screen on some pages.
This is, of course, our fault for not having enough content to fill the screen. This will be fixed
in the future.