Factor out search fields into partial.
Work on setting up good css paradigm.

Start with splash page. The welcome controller sets a variable calles
@pagename to "splash"; the application layout then uses that variable
as the body class and id. This allows the css to affix general body
styles to a given page as long as other controllers bother to declare
their pagenames.

Also added a body stylesheet, which keeps track of all the full body
styles. Right now just the one for splash.