- implement new form osusers.forms.AddSshPublicKeyForm
- move message texts from osusers.admin to osusers.forms
- add new view osusers.views.AddSshPublicKey
- add new URL patter 'add_ssh_key' to osusers.urls
- add new template osusers/sshpublickey_create.html
- link from hosting package detail template to 'add_ssh_key'
- add changelog entry for new feature
