Refine common elements

There are some elements throughout the application that share the same
look and feel but are using different styles namely the page, content
area and sidebar. This abstracts those elements into common classes.
Admins can't manage if this is scoped to current_user.

Admins have the permissions to manage organizations but if the
organization is found scoped to the current_user then admins can only
manage their own organizations.
Merge pull request #535 from opscode/refine-common-styles

Refine common elements