Plone4-csrffixes

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Breaking changes:

- *add item here*

New features:

- *add item here*

Bug fixes:

- In README, show buildout configs per Plone version. [maurits]

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Bug fixes:

- Updated documentation on versions and on the necessity of this package. [maurits]

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New features:

- Depend on ``plone.protect 3.0.19`` or higher. This adds
``protect.js``, so we do not have to do this anymore. See issue
https://github.com/plone/plone.protect/issues/42
[maurits]

- Factor out referrer/origin backstop into its own method so it can be
customized on a subclassed transform.
[lgraf]

Bug fixes:

- Change extension of CHANGES and README from txt to rst.
[gforcada]

- include a setup.cfg and a .editorconfig file with code conventions:
- settings for isort
- plone styleguide settings
[loechel]

- apply code conventions [loechel]

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- fix potential issues with tinymce patch
[vangheem]

- Add documentation for loading plone4.csrffixes for robot framework testing
[lbrannon]

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- Fix issue where redirects would contain an unparsable response
[vangheem]

- make plone lock operations safe
[vangheem]

- Check options before trying to work on them
[ale-rt]

- Use "application/javascript" media type instead of the obsolete "text/javascript".
[hvelarde]

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- Skipped by mistake.