new theme

Made most of the changes in the To Do list:

[x]link colors for links on blue background and tags on pattern pages.
[x]make the background color of the footer stretch down when the page
isn't as long as the viewport
[x]move twitter icon into the pattern page instead of the small preview
[x ]fix up footer copy; include a brief project description e.g.
http://lopad.org/civicpatterns
[x ]add short descriptions to home page carrousel have a favicon
[x ]improve the home page text (e.g. http://lopad.org/civicpatterns)
our logo is awesome, let's have a big one on the home page
[ x] nav: would a simpler listing be easier to browse?
[ x]nav: how do I get from a pattern page to one that isn't in that
section - via the home page?