Add support for Python 3

[pbauer]

Fixes #128

TODO:

• Fix all tests
• Make sure it still works in py2

[tisto]

@pbauer wouldn't it make sense to always start a Python 3 migration with setting up a Travis job that runs the Py3 jobs additionally and marked as allowed failure? This way you can work on Py3 step by step making sure you don't break py2.

[petschki]

@pbauer getting near ... Plone 5.2/py2/py3 tests are green but Plone 5.1 and robot tests are currently deactivated ... stay tuned and DO NOT MERGE RIGHT NOW 😉

[petschki]

missing things for merge and release:

• rewrite robottests for Plone 5.1+ selectors (I did already a few)
• forceSSL redirect not working in 5.1 because testbrowser is not really logged out (still has cmf.ModifyPortalContent permission)
• investigate failing doctests for 5.1 (mentioned here #139 ) because of ZPublisher.HTTPResponse.default_encoding = 'iso8859-15'

the last one is weird because if you run your instance on 5.1 in a "real life browser" and navigate to the field view it works. Anybody has a hint how to fix this for the zope.testbrowser @jensens @davisagli ?

@djay if ok, we'll fix your pull request here and I'll close your's ...

[petschki]

If someone wants to put some love in the todo_*.robot tests feel free ... I'd recommend to merge and release this PR and make testing enhancements in a new PR.

/cc @pbauer @jensens

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[jensens]

I agree, this can be merged.

The version then needs to be increased on feature level.

Since it is a massive change-set I would be super-safe and release first a RC. So, this can be field-tested and taken with a grain of salt.

[pbauer]

Thanks @petschki for seeing this through to the end 😄

[jensens]

and .... RELEASED https://pypi.org/project/collective.easyform/2.1.0rc1/