Install tox in a virtualenv

Since TravisCI has an extremely old version of PyPy, we need to use pyenv to install a more recent version. However, pyenv's shims don't persist between the install and script portions of Travis. So we have to use a virtualenv so Travis can find the tox command.
yaml · Nov 23, 2016 · 55459a8 · 55459a8
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commit 55459a8
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diff --git a/.travis.yml b/.travis.yml
@@ -25,4 +25,5 @@ install:
     - ./.travis/install.sh
 
 script:
+  - source ~/.venv/bin/activate
   - tox
diff --git a/.travis/install.sh b/.travis/install.sh
@@ -14,4 +14,6 @@ if [[ "${TOXENV}" = pypy* ]]; then
 fi
 
 
+python -m virtualenv ~/.venv
+source ~/.venv/bin/activate
 pip install --upgrade tox