moved site header and footer into partials.

also moved call to require_js_include_tag()
to right after the footer.
put require_js_include_tag() back above Google Translate, as per #462
rewrote header and footer in HAML
HAML cleanup

* switched to Ruby syntax for attributes
* use single quotes whenever possible
* no trailing whitespace
* deleted old ERB templates
Fix conflicts and merge Declan's branch.
Merge branch 'purplebinder-move-header-and-footer-to-partials'