Enable coveralls

Do this everywhere for simplicity. It slows PyPy down by 3x, but that should still only be around 4s.

.travis.yml

@@ -56,14 +56,18 @@ before_install:
     - 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
 install:
-    - pip install -U pip setuptools cffi wheel
+    - pip install -U pip setuptools cffi wheel coverage coveralls
     - pip install -U -e .[test]
 script:
     - python --version
-    - zope-testrunner --test-path=. --auto-color --auto-progress
+    # coverage makes PyPy run about 3x slower, but the tests only take
+    # .4s to begin with (the whole process takes about 1.5), so that's
+    # still only 4.5s, which is maneagable.
+    - coverage run -m zope.testrunner --test-path=. --auto-color --auto-progress
 notifications:
     email: false
 after_success:
+    - coveralls
     - echo [distutils]                                  > ~/.pypirc
     - echo index-servers = pypi                        >> ~/.pypirc
     - echo [pypi]                                      >> ~/.pypirc