Use application template to fix back button issue.

Because products/index and product are both under products, they would
render inside of eachother when using the back button.  By removing
actual content from the products template, we keep that content from
being duplicated.
Basic implementation of tags.

Ugly look for it and I want to keep the tags on the page the whole time,
but this will work for now.
Increase font size for readability.
Convert products route into a resource.

Nouns should be resources not routes so let's take care of that.
Make tag route redirect to products route for the tag.