Added markup for sliding search bar.
Added style to sliding search bar.

Also changed markup a tiny bit.
Hiding sliding search bar in sm and xs modes.
Focusing input field on kbSearchToggle clicks.
Wrapped sliding search bar into our search form.
Chenged search input fields type from text => search.
Hooked up searchfield in mobile menu top too, so it calls our google site search.
Added little doomsspear (triangular pointer) to search-slidedown bar.
Aligned search-slidedown button with Signes design.
Added closing logic to search-slidedown.