Plone-app-theming

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Bug fixes:

- Added a failing (5.1) test for fileuploads in the theme editor that breaks when plone.rest is installed. Fix is in https://github.com/plone/plone.rest/issues/59
[djay]

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Bug fixes:

- remove mention of non-existent Example theme
[tkimnguyen]

- Prepare for Python 2 / 3 compatibility
[pbauer, ale-rt]

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Bug fixes:

- Remove unittest2 dependency
[kakshay21]

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Breaking changes:

- Let the pattern configuration of the thememapper be in JSON format.
Fixes problems of thememapper working together with latest patternslib (2.1.0).
[thet]

Bug fixes:

- Fix thememapper pattern handling of buttons (via mockup update).
Update thememapper bundle.
[thet]

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Bug fixes:

- Reduce log level of ThemingPolicy cache to 'debug'.
[jensens]

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Bug fixes:

- Fix imports from Globals that was removed in Zope4
[pbauer]

- No longer patch Control Panel internals, as it was removed in Zope4
[MatthewWilkes]

- reST syntax, styleguide, wording and line length of the docs
[svx]