title: butterknife zelezny can't show in generate menu for AndroidStudio1.3.1
body: <p>My Android studio version is 1.3.1,
  When I add the plugin of butterknife zelezny 1.3.2 by the step:
  download it and install via Preferences → Plugins → Install plugin from disk.</p>
  
  <p>but, failed to show the button of "Generate ButterKnife Injections" in the menu of generate.</p>
  
  <p>what's reason of this issue? How can resolve it?
  Thanks.</p>