Plone-app-blob

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New features:

- Adapt tests to the new indexing operations queueing.
Part of PLIP 1343: https://github.com/plone/Products.CMFPlone/issues/1343
[gforcada]

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Bug fixes:

- Make sure core permissions are defined.
This fixes `issue 30 <https://github.com/plone/plone.app.blob/issues/30>`_.
[maurits]

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Bug fixes:

- Make doctests work with new zope.testbrowser based on Webtest.
[pbauer]

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Bug fixes:

- Add coding headers on python files.
[gforcada]

- More flexible test of getIcon.
[jensens]

- Update code to follow Plone styleguide.
[gforcada]

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Fixes:

- Use zope.interface decorator.
[gforcada]

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Bug fixes:

- Add a note to monkey.py for when it is possible to remove it.
[gforcada]