xmlcomms.js: clean-up file vars
textareas.js/xmlcomms.js: handle keyboard shortcut

Add a window.onkeydown handler to handle keypresses when no text area is
in focus. This allows me to trigger the editor with a foreground message
on the Chromebook.
textareas.js: clean-up file vars
textareas.js: add a little logging
xmlcomms.js: more debug output
Merge branch 'master' of github.com:stsquad/emacs_chrome