Fix hasRendered error

We are getting an error when rendering a view after removing other views
because we are deleting the old selector from the view object
Fix disappearing logout link

Also add header link when user is already logged in and is reloading
the browser which does not change the session

Closes COUCHDB-2357
Revert "Url-encode document-ids properly"

This reverts commit 92964af8ee93c53677b8abaea9463fd9ae7a4d7f.

This causes that you can not save an edited design document