Move view components specs to spec/views/components
Introduce Admin Resource Tabs

An extensible way of adding content to active admin resource views.
Turn admin panels into admin resource tabs
Change Favicon Path to Theme Directory

As reported in #146, the favicon should be looked for in the theme
directory.
Merge pull request #164 from tf/favicon-path

Change Favicon Path to Theme Directory
Merge pull request #165 from tf/admin-tabs

Admin Tabs