Collective-lastmodifier

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- Nothing changed yet.

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- Add Plone 5.1 support. [mathias.leimgruber]
- No longer support AT officially. [mathias.leimgruber]

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- Drop plone 4.2 support [Nachtalb]
- Fix obsolete information in README.rst [Nachtalb]
- Make set_last_modifier reusable [Nachtalb]

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- Use IDexterityContent instead of IDexterityItem to match all dexterity
contents.
[cedricmessiant]

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- Let ILastModifier fallback to the creator.
[jone]

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- Drop Plone 4.1 support.
[jone]

- Implement dexterity support.
[jone]

- Implement an ILastModifier adapter.
[jone]

- Implement uninstall for the package.
[jone]