Kinto-amo

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- Nothing changed yet.

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**Bug fixes**

- Fix last update / last modified of blocklist XML endpoint (fixes 25)

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- Pass application ID and version to amo2kinto code when generating blocklist.xml. (23)

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**New features**

- Add support for cache control headers (``If-None-Match`` and ``If-Modified-Since``) (fixes 21)

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- Add the plugin version in the capability. (15)
- Enable creation of preview XML files from other collections. (18)

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- Update to ``kinto.core`` for compatibility with Kinto 3.0. This
release is no longer compatible with Kinto < 3.0, please upgrade!