reverting addition of osx didn't help

Adding osx back.

Also adding back -j99, in hopes of getting quicker runs and making
travis nor hate us so much.  But then, we'll probably get more
failures. Maybe the best option will be to just make test pass even
when starved. :(

.travis.yml

 language: python
 sudo: false
-python:
-    - 2.7
-    - 3.3
-    - 3.4
-    - pypy
+matrix:
+    include:
+        - os: linux
+          python: 2.7
+        - os: linux
+          python: 3.3
+        - os: linux
+          python: 3.4
+        - os: linux
+          python: 3.5
+        - os: linux
+          python: pypy
+        - os: linux
+          python: pypy3
+        - os: osx
+          language: generic
+          env: TERRYFY_PYTHON='homebrew 2'
+        - os: osx
+          language: generic
+          env: TERRYFY_PYTHON='macpython 3.4'
+        - os: osx
+          language: generic
+          env: TERRYFY_PYTHON='homebrew 3'
+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 setuptools
     - python bootstrap.py
     - bin/buildout
 script:
-    - bin/test -vvv1
+    - bin/test -v1 -j99
 notifications:
     email: false