Merge: nitweb: close quicksearch box when clicking outside of it

Merge: nitweb: close quicksearch box when clicking outside of it

* Add some crappyjs(TM) to autoclose the search box when the user click somewhere else.
* Also autoclose the box when the user click on a link from the list (unwanted js sideeffects are sometimes wanted)

Checks one more box from #2178

Demo: http://nitweb.moz-code.org

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

Pull-Request: #2354