Fix invite error handling.
Admin user fixture.
Fix dummy login target.
Fix invitations.
Users that log in, are at invitations level 0.
Invitations improvements
Refs #1588Refs #1599
Dummy login target, that will only redirect if the cookie is set.
Check for token validity instead of existence
Merge branch 'master' of https://code.grnet.gr/git/pithos into invitations
Conflicts: pithos/im/models.py
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