Collective.celery

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Fixes:

- provide PARENTS value on the request object
[vangheem]

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Fixes:

- detect location of zope conf
[vangheem]

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Fixes:

- be able to use compound celery commands
[vangheem]

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Fixes:

- If eager mode used, do not switch users
[vangheem]

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New:

- nothing yet

Fixes:

- More test fixes. Provide setApp method to use in test setup
[vangheem]

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New:

- nothing yet

Fixes:

- Fix use of CELERY_ALWAYS_EAGER so this package can be include in tests without
too many gymnastics
[vangheem]