* Add failing test

* Don't assume master branch is default

* Don't expect output to stderr

* Use the 'short ref' instead of the 'full ref'

* Run isort on the codebase

Command: isort --recursive --skip __main__.py --skip _vendor -o pip._vendor -sd THIRDPARTY -m 5 -p pip -p tests ./pip ./tests

* 📰

flake8 ignores some errors by default, these ignored by defaults
change sometimes. This will make things stabler by selecting
everything.

* Move virtualenv creation out of TestPipEnvironment
* Remove global state and force explicit use of TestPipEnvironment
  instances
* Remove "backup" virtualenv copying and instead create new
  virtual environments each time.
* Remove the monkeypatched "PyPICache" functionality
* Remove things that were not being used anymore and were dead
  weight
* Remove sitecustomize support which was primarily used to
  monkeypatch the "PyPICache" but was used in one or two other
  tests.

These tests fail on Windows - issue #557

Incorrect blank lines E302 and E303.

Tag pushed so make this less brittle.

Reran tests after changes on 2.4, 2.6, 3.2 all pass.

=====================================================
================== Running pep8 =====================

Searching for pep8
Reading http://pypi.python.org/simple/pep8/
Reading http://github.com/cburroughs/pep8.py/tree/master
Reading http://github.com/jcrocholl/pep8
Best match: pep8 0.6.1
Processing pep8-0.6.1-py2.6.egg
pep8 0.6.1 is already the active version in easy-install.pth
Installing pep8 script to /Users/pnasrat/Development/pip/pip_virtualenv/bin

Using /Users/pnasrat/Development/pip/pip_virtualenv/lib/python2.6/site-packages/pep8-0.6.1-py2.6.egg
Processing dependencies for pep8
Finished processing dependencies for pep8

==================== Ended pep8 =====================
=====================================================

Another try at fixing #32 and #161. Use git fetch instead of git pull (which fetches and merges), before checking out the wanted commmit.