Fix compatibility with Pyramid 1.8

[fschulze]

This fixes #22, but there are 4 more test failures about derived_views which I don't understand yet.

[mmerickel]

Previously those views were registered for both IViewClassifier and IExceptionViewClassifier. In Pyramid 1.8 they are registered only for IExceptionViewClassifier so probably the test should just be switched to that.

I noticed one other thing which is that Pylons/pyramid#2757 dropped pyramid.config.expand_action because I had no idea anyone was using it but it's apparently quite heavily used throughout the tests. Since 1.8 this line will never work:

pyramid_zcml/pyramid_zcml/tests/test_units.py

Line 1353 in 5d162f1

from pyramid.config import expand_action

No good recommendation here but I'd rather not bring it back into Pyramid...

[fschulze]

I've switched to use IExceptionViewClassifier. This also works with older Pyramid versions. I have a branch where I added environments for testing that. Not sure you want that merged, because it isn't integrated with Travis and there is a PR open that changes Travis/tox stuff.

It seems like the fallback import from zope.configuration.config import expand_action works fine, so I don't see a need for action there.

Python 2.6 fails with Pyramid 1.8, but works with older Pyramid versions.

PyPy3 currently fails, because virtualenv or pip is incompatible with it, because it's currently only supporting Python 3.2.

[stevepiercy]

FWIW Python 2.6 support was dropped in Pyramid 1.7, and we dropped PyPy3 support until it supports Python 3.4+. We dropped Python 3.2 in Pyramid 1.7, and Python 3.3 in Pyramid 1.8.

Pyramid 1.8 is tested and supported on Python 2.7, Python 3.4, Python 3.5, Python 3.6, and PyPy.

[fschulze]

I have a branch now that tests everything with travis: https://github.com/fschulze/pyramid_zcml/tree/tox-travis

[mmerickel]

Yep this all looks as expected. Thanks @fschulze. @mcdonc is the only one with access to pypi so he'll need to cut a new release or give someone access (you?) to do it.

[mmerickel]

@fschulze Apparently I ended up with pypi ownership so I've given you pypi access if you wish to cut a release of pyramid_zcml. You are also now an admin on this repo if you wish to manage merge requests.