Allow The Ability To Disable Store Hints for Spree Expert Users.

[MatthewKennedy]

Not that having hints is such bad thing, but it might be an idea for admin users of Spree to be able to create a new role expert and apply that role to their own user account, and then the any admin user tips that are there for beginners will be removed from the DOM by a helper method that simply looks for the current admin user having the role of expert.

<% unless spree_expert_user? %>
  <p> beginner info message...</p>
<% end %>