Collective.big.bang

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- Added tests and better support for plone from 4.3 to 6.0.
[odelaere]

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- Strip extension ids.
[odelaere]
- Do not attempt to do anything if ACTIVE_BIGBANG id not True.
[odelaere]

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- Fix package after renaming from collective.bigbang to collective.big.bang
[laulaz]

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- Initial release.
[bsuttor]