Use new travis-ci container based builds

.travis-workarounds.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-set -e
-set -x
-
-if [[ "${TOXENV}" == "pypy" ]]; then
-    sudo add-apt-repository -y ppa:pypy/ppa
-    sudo apt-get -qy update
-    sudo apt-get install -y pypy pypy-dev
-    # This is required because we need to get rid of the Travis installed PyPy
-    # or it'll take precedence over the PPA installed one.
-    sudo rm -rf /usr/local/pypy/bin
-fi
-
-# Workaround travis-ci/travis-ci#2065
-pip install -U wheel

.travis.yml

@@ -1,12 +1,12 @@
 language: python
 python: 2.7
+sudo: false
 env:
 - TOXENV=py27
 - TOXENV=precise
 - TOXENV=py33
 - TOXENV=docs
 install:
-- "./.travis-workarounds.sh"
 - pip install -U tox
 script: tox
 notifications: