Fix keyboard unbindings.
Fix keyboard unbindings.

There was a bug when unbinding key handlers.  Mousetrap always expects
an array of key sequences, and we were passing one at a time.

Also, jQuery's toggleClass treats 0 as true, so ensure that we always
use a boolean.

OpenGeoscience/geojs,OpenGeoscience/geojs,Kitware/geojs,Kitware/geojs,Kitware/geojs,OpenGeoscience/geojs