Added extra close keybinding

You can now hide the side-menu by clicking on a different part of the
screen, or by pressing Escape.
Make body non-scrollable when menu is shown

Make the body non-scrollable when menu is displayed, to prevent weird displays with the menu.
Latest changes

Add the latest changes from src:
@fa7dbda
@5a8749a
Merge pull request #5 from niknetniko/escAndSideClick

Merge escAndSideClick into betaTest