Django-messages-ui

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* Add option for function called after closeLink is clicked.

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* Add option for function called on transient messages after transientDelay.

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* Add response.no_messages option for disabling middleware.

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* Rewrite using method plugin architecture; simpler 'add' method to add msg.
* Add option to display unescaped HTML in message content.

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* Add option to use Handlebars.js (new default) instead of ICanHaz.js.

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* Make close-link selector specific to within a message; use preventDefault.