CSS rework, aligned view on all pages
removed google JS from pages which do not require it

fixes #236 - Installation media are now usable with more than one operating system.

Ensure that all index views and controllers are consistent

Ensures that all controllers use @search in the index method
Ensure that all index views use pagination

fixes #235 - Small refactoring of the media handling for operating system families: * Use URI class for any URI related operations * Added substitution for $version, $major and $minor in media path * Force use of http(s)|ftp|nfs URI schema: NFS shares have now to be entered in URI form: nfs://server/path/.../ instead of server:/path/.../

removing show action in places it doesn't make sense, and minor visual changes

fixes #202 - Remove activescaffold from the medias page