Change logo.png

The old one didn't have the bright well positioned
Style menu and active state classes
Move stores description down
Render :index in stores#show action
Change Contact link to mail_to link
Move footer to a publich layout partial
Minor typo
Scaffold Admin#Categories new and index
Add Categories
SHow available stores in the admin side
Add options for index in admin
Add slug to categories
Display categories in the store index