Plone.app.caching

Breaking changes:

- Replace `plone.app.caching` import step with a post handler.
Removed the `plone.app.caching.txt` Generic Setup flag file that was needed by the import step.
[maurits] 139


New features:

- Add uninstall profile.
[maurits] 139

Bug fixes:

- Add Zope to dependencies. Update config files with plone/meta.
[maurits] 1

Bug fixes:

- Fix purging of image scale paths for Dexterity content.
[erral] 136


Internal:

- Update configuration files.
[plone devs] cfffba8c

Bug fixes:

- Fix `locked` component of ETag to discriminate between different locks. JeffersonBledsoe, davisagli 122

Internal:

- Update configuration files.
[plone devs] e08b1234, fb4615d7


Tests

- Fixed tests that compared a stable time with a ten year old Expires handler.
[maurits] 127

Tests

- Changed hardcoded test date to June instead of May to temporarily fix a testing error.
See `issue 127 <https://github.com/plone/plone.app.caching/issues/127>`_.
Needs a proper fix within a month.
[maurits] 127