incorporated sticky footer and organized CSS in preparation for style overhaul
added 960 grid to project
incorporated the 960grid in the header, content, and footer. now need to clean out responsive classes in the content divs
moved login form into header, moved sign up form into splash page when user not logged in
made stylistic changes to the header, footer, and buttons
made stylistic changes, including new button styles. also rewrote some tests that became ambiguous upon when adding the new_user_sign_up form to the splash page alongside the login_form