enable zoom control buttons by default (Fixes #33).

If you want maximum screen estate you can disable them until you clear your
cache:

  Firefox: CTRL+SHIFT+K
  Opera/Chrome: CTRL+SHIFT+I, select console

Then enter the following and hit enter:

  localStorage['iitc.zoom.buttons'] = 'false'

You can enable them by exchanging “false” with anything else or by clearing
your cache. You can close the web developer console by hitting the shortcut
again or clicking the x-button somewhere.