Improved the layout of summary boxes and moved configs to ownership.css
Added a stub for future UserFormatter extensions.

Signed-off-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Added OwnershipLayoutFormatterProvider extension point (stub for the future)

Signed-off-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Merge pull request #25 from jenkinsci/ui_refactoring

UI refactoring