title: Search form with acts_as_taggable_on (Rails 3)
body: <p>I have a searchbox to search for products.  Each product has a title and is tagged with multiple tags.</p>
  
  <p>I want to be able to search for products by title or tag.  In other words if I have a product called "Green Tea" and another product tagged "green, red, blue" and I type "green" into the searchbox, I'd like both products to appear in the search results.</p>
  
  <p>I am using Rails 3, acts_as_taggable_on, Ruby 1.9.2.</p>