install Twitter bootstrap on layout and home
add footer and move header/footer to partials

* add a footer to the application layout
* add footer styles to stylesheet
* move header and footer html to partials
* add an html5 shim partial for IE8 and below compatibility
refactor stytlesheet sass
rewrite tests to use named routes
add named routes for static pages
add correct links to static pages on header/footer
refactor static_pages spec

The spec file for the static pages was getting a bit verbose and messy,
so I cleaned it up a bit using before blocks and subject

Also, changed the title of the Contact page to be more consistent with the
other static pages
add user signup page