title: npm run webdriver-manager-update seems bugged
body: <p>It's my first practical expirience in using of npm package manager so don't beat me : ). Running npm at windows 8 I faced with a error which could not fix.</p>
  
  <p>That's what I got: <a href="http://tinypic.com/r/2yjpufr/8" rel="nofollow">npm error</a></p>
  
  <p>As you can see, script throwed an error when faced with "<strong>.</strong>" symbol. Think it's because windows does not support partial links like "./bla/blabla/blablabla".
  Also by some reason the path to webdriver-manager seems to be broken. It starts with 'C:\' and ends with './node' because the symbol '>' (dunno how to name it) separates them in two lines. Still do not understand how to fix it on windows 8. Suppose that webdriver-manager script thinks that './node_modules/protractor/bin/webdriver-manager'  is the absolute path to this script. </p>