Fixed Meta class in example.models according to fixed README. closed #2

Fixed bug: the command `python manage.py syncdb --database=default` caused
`Creating table BusinessHours`
Merge pull request #46 from freelancersunion/generic-foreign-key-support

Simple generic foreign key support
Merge pull request #49 from hynekcer/wrk

Fixed Meta class in example.models according to fixed README. closed #2
Merge remote-tracking branch 'union/generic-foreign-key-support' into HEAD
Fixed infinite loop with slow memory overfow in "values()" queryset method.

Closes #50.
Fixed reproducible raw queryset length bug
Support for "cursor.execute(sql)" direct queries.
Fixed a usable default size for "fetchmany()"
Fixed typography related to previous commits.