Add vacuum command.

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Bump version to 0.23
Support for signature token based account verification.
Switch to WebSocket-Resources

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Account for websocket-resources changes.

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Bump version to 0.24

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Switch to production APN endpoint.

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Update APN payload.

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Use push microservice instead of doing push directly.

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Bump dropwizard version.

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Add feedback handler.

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Fix APN push payload.

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Bump version to 0.25

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