Removed repoze.what dependency

TurboGears 2.2 has that functionality built-in now
Upgraded repoze.who to v2.1
Removed tg.devtools dependency
Merge pull request #49 from Turbo87/repoze-what

Removed repoze.what dependency
controllers, model: Use innerjoins where possible
model/follower: Use joined loading for follower lists
model/auth: Use joined loading for permission lists
Merge pull request #50 from Turbo87/joins

Improved JOIN instructions
Changed #!/usr/bin/python to #!/usr/bin/env python

This makes it possible to use virtualenv properly with SkyLines
Merge pull request #51 from Turbo87/shebangs

Changed #!/usr/bin/python to #!/usr/bin/env python
Revert "controllers/base: Removed obsolete identity handling code"

This reverts commit 237f538970cc5d44456c3556d12da6f779a2c856.

Turns out this is useful when the user decides to change his email address.
In that scenario the identity dict will be {} which is True-ish but there
will be no information inside. Until there is a better solution we log the
user out in such cases.
AUTHORS: Added missing translators