Dexterity.membrane

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- Nothing changed yet.

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- Remove deprecation warnings.
[ale-rt]

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- Fix for `AuthEncoding >= 5.0`.
[petschki]

- Rename profile `dexterity.membrane: example` -> `dexterity.membrane: content`
and add uninstall profile for it.
[petschki]

- Remove py2.7 and Plone < 5.2 support.
[petschki]

- Warning: The package is not tested anymore on Plone 5.2 and Python 3.6
because Plone 5.2 is not tested as well on that Python version.

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- remove `<includeDependencies />`
[petschki]

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- Performance improvements: cache expensive bcrypt operations
[ale-rt]

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- Plone5.2 porting: do not require Archetypes
[ale-rt]

- ZCML namespace cleanup.
[thet]

- Added uninstall profile
[agitator]