Client model creation.
Added urls and views.
Added the clients app to the settings.
Added the migrations.
Started multi tenant support for clients.
Get the client menu ready.
First draft for the client application.
Plugged the client app into the urls.
Removed the FK to Site.
Use client_id as url identifier.
Removed the FK to Site.
Add the clients app to the tests.
Use the new client model and cleaned the migrations.
Set the title for list pages.
Client detail page.
Merge branch 'feature/gh46' into develop
Merge remote-tracking branch 'origin/develop' into feature/gh47