beginnings of a basic API for instantiating an Itchpad
Merge branch 'master' into itchpad-api

Conflicts:
	lib/main.js
loading iframe
UI shows up now
fix typo and now file contents show
update edit menu items
remove logging and old commented out code
remove itchpad-window.js
add itchpad-window.xul
return promise if window exists when opening itchpad window
update README with new API
remove logging in itchpad-window
add keyboard shortcut to provide same action as menu item (cmd+shift+i)
Merge branch 'itchpad-api'