Collective.cloudfront

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- Nothing changed yet.

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- Drop python2 and Plone < 5.2 compatibility [erral]

- Fixes issue 2: remove includeDependecies [rber474]

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- only run purging if add-on is installed
- check if purging is enabled in plone.app.caching
[abl123]
- Show the string representation of the exception
[skurfer]
- Set custom permissions for purging
[cdw9]

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- add button for invalidating cache
[cdw9]

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- Initial release.
[sixfeetup]