Merge pull request #25 from verbunden/interface

Header Effect
['redirect'] = '/foo/bar'
Session
Merge pull request #26 from verbunden/session

Session
order & kram (uid in id geändert)
Merge remote-tracking branch 'origin/redirect'

Conflicts:
	shop/entity/User.php
UID > ID
Merge pull request #28 from verbunden/session

UID > ID
Merge pull request #29 from verbunden/interface

Interface update
Interface update