Use macpython everywhere. (#62)

* Use macpython everywhere.

Add 3.6 for mac.

See zopefoundation/persistent#59

* Manually install persistent for travis.

* plain pypy3 is python 3.2 which won't run newer setuptools

.travis.yml

@@ -15,22 +15,35 @@ matrix:
         - os: linux
           python: pypy
         - os: linux
-          python: pypy3
+          python: pypy3.3-5.2-alpha1
+        # It's important to use 'macpython' builds to get the least
+        # restrictive wheel tag. It's also important to avoid
+        # 'homebrew 3' because it floats instead of being a specific version.
         - os: osx
           language: generic
-          env: TERRYFY_PYTHON='homebrew 2'
+          env: TERRYFY_PYTHON='macpython 2.7'
         - os: osx
           language: generic
           env: TERRYFY_PYTHON='macpython 3.4'
         - os: osx
           language: generic
-          env: TERRYFY_PYTHON='homebrew 3'
+          env: TERRYFY_PYTHON='macpython 3.5'
+        - os: osx
+          language: generic
+          env: TERRYFY_PYTHON='macpython 3.6.0'
 before_install:
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then git clone https://github.com/MacPython/terryfy; fi
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then source terryfy/travis_tools.sh; fi
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then get_python_environment $TERRYFY_PYTHON venv; fi
     - if [[ "$TERRYFY_PYTHON" == "homebrew 3" ]]; then alias pip=`which pip3` ; fi
 install:
+    - pip install -U pip setuptools
+    # persistent is a setup_requires, which gets downloaded by
+    # setuptools, not pip. But macpython 3.6.0 setuptools has trouble with SSL on
+    # Travis CI
+    # (https://travis-ci.org/zopefoundation/BTrees/jobs/192340692) so
+    # we install with pip manually.
+    - pip install -U persistent
     - pip install -e .[ZODB]
 script:
     - python setup.py -q test -q
@@ -50,3 +63,5 @@ after_success:
 env:
     global:
         secure: "Oh5gRJ+Fo8ZNmCkdrffpx201EPyTr9iUXmv6VqJMTebrzQpFdSWUVcANRmAzyfdyk3Wo0IjifVfWsKc+hvtbFmXZiLRFyEgoCUmzeWVumjebg2xxm0PbFHcRQgl4daBXxB0iqWkP8wXZ3daytuL74sYcbHizMYyhc7AxFbANsZc="
+
+cache: pip