Fixing the PEP8.
Change display of brand list
Add logo in owner list
Fix Brand and Owner public links (missing / would get a 404 on brand/ and owner/)

Also follow the same URL scheme as admin (which always have trailing
slash)
Fix bug with double owner_cd in URL to owner detail
Change Style Brand list, add proposal form
Merge pull request #47 from FrancoisDupayrat/FixLinks

Fixing links.