Remove OSX from our build matrix

The Travis OSX builders are incredibly inconsistent for how long
they take to run our test suite. It is currently ranging anywhere
from ~15 minutes to well beyond 50 minutes, at which point it
times out.

.travis.yml

@@ -1,8 +1,4 @@
-language: c
-
-os:
-  - osx
-  - linux
+language: python
 
 env:
   - TOXENV=pep8
@@ -32,21 +28,3 @@ notifications:
       - "irc.freenode.org#pypa-dev"
     use_notice: true
     skip_join: true
-
-# When building an exclude matrix on Travis you must supply the exact variable
-# combinations you want to exclude from your build matrix. There is no
-# (current) way to make this less verbose.
-matrix:
-  exclude:
-    - os: osx
-      env: TOXENV=pep8
-    - os: osx
-      env: TOXENV=py3pep8
-    - os: osx
-      env: TOXENV=docs
-    # We exclude these because they take so long, theortically an issue could
-    # show up only on 3.2 or PyPy on OSX. However (hopefully) that is unlikely.
-    - os: osx
-      env: TOXENV=py32
-    - os: osx
-      env: TOXENV=pypy

.travis/install.sh

@@ -1,89 +1,9 @@
 #!/bin/bash
-
 set -e
 set -x
 
-if [[ "$(uname -s)" == "Darwin" ]]; then
-    brew update
-    brew install bazaar
-    brew install pyenv
-
-    if which pyenv > /dev/null; then eval "$(pyenv init -)"; fi
-
-    # Adapted from Ubuntu 14.04
-    PYTHON_CONFIGURE_OPTS="--enable-unicode=ucs4 --with-wide-unicode --enable-shared --enable-ipv6 --enable-loadable-sqlite-extensions --with-computed-gotos"
-    PYTHON_CFLAGS="-g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security"
-
-    case $TOXENV in
-        py26)
-            pyenv install 2.6.9
-            pyenv global 2.6.9
-            ;;
-        py27)
-            pyenv install 2.7.6
-            pyenv global 2.7.6
-            ;;
-        pypy)
-            pyenv install pypy-2.2.1
-            pyenv global pypy-2.2.1
-            ;;
-        py32)
-            pyenv install 3.2.5
-            pyenv global 3.2.5
-            ;;
-        py33)
-            pyenv install 3.3.5
-            pyenv global 3.3.5
-            ;;
-        py34)
-            pyenv install 3.4.0
-            pyenv global 3.4.0
-            ;;
-    esac
-
-    pip install virtualenv
-
-    pyenv rehash
-else
-    # add mega-python ppa
-    sudo add-apt-repository -y ppa:fkrull/deadsnakes
-    sudo apt-get -y update
-
-    case $TOXENV in
-        py26)
-            sudo apt-get install python2.6
-            ;;
-        py32)
-            sudo apt-get install python3.2
-            ;;
-        py33)
-            sudo apt-get install python3.3
-            ;;
-        py34)
-            sudo apt-get install python3.4
-            ;;
-        py3pep8)
-            sudo apt-get install python3.3
-            ;;
-        pypy)
-            sudo add-apt-repository -y ppa:pypy/ppa
-            sudo apt-get -y update
-            sudo apt-get install -y --force-yes pypy
-            ;;
-    esac
-
-    sudo pip install virtualenv
-fi
-
 git config --global user.email "[email protected]"
 git config --global user.name "pip"
 
-virtualenv ~/.venv
-source ~/.venv/bin/activate
-
 pip install --upgrade setuptools
 pip install tox
-
-if [[ "$(uname -s)" == "Darwin" ]]; then
-    pyenv rehash
-fi

.travis/run.sh

@@ -1,14 +1,11 @@
 #!/bin/bash
-
 set -e
 set -x
 
 # This is required in order to get UTF-8 output inside of the subprocesses that
 # our tests use.
 export LC_CTYPE=en_US.UTF-8
 
-source ~/.venv/bin/activate
-
 case $TOXENV in
     py32)
         tox