title: How can I configure sass with ionic.
body: <p>I am using the default ionic seed application, I have ran the setup 
  command <code>ionic setup sass.</code>
  I run <code>ionic serve</code>, this should be watching for sass changes but it's not.
  I tried to run <code>gulp watch</code> but I am getting an error.<code>Error: Cannot find module 'semver'</code></p>