Plone.outputfilters

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Bug fixes:

- Remove unittest2 dependency
[kakshay21]

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Bug fixes:

- Do not transform a and img tags when inside script tag.
[gotcha]

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Breaking changes:

- Give up support of PortalTransforms 1.x with old style interfaces.
[jensens]

Bug fixes:

- Handle unicode errors in img attributes
[vangheem]
- Cleanup: utf8-headers, isort, pep8
[jensens]

- Use zope.interface decorator.
[gforcada]

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Bug fixes:

- Make tests work with old and new safe HTML transform
[tomgross]

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Fixes:

- Explicitly exclude ``mailto:`` links from being UID-resolved.
[thet]

- Fix test isolation problem.
[thet]

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New:

- Added ``tel:`` to ignored link types.
[julianhandl]