Add note about updating system path

Remind users to update system path since script does not. 

Well, at least on Windows it doesn't update PATH. Perhaps this should be qualified?
Merge pull request #1888 from patricktokeeffe/patch-1

Add note about updating system path
get-pip.py option examples

Conflicts:
	docs/installing.rst
break out the examples so we can add a qualifying footnote for --user installs

Conflicts:
	docs/installing.rst
Merge pull request #1944 from qwcode/critical_get-pip_docs

docs for get-pip.py options
Replaces spaces in username.
Merge pull request #1986 from matham/master

Replaces spaces in username.
Revert "Merge pull request #1986 from matham/master"

This reverts commit cb26c0b8cb00d18c75503ce4ee59a95a619e8189, reversing
changes made to bb8c7428ab40dde4af92e696ff518e82e214cd24.
Support importing from Wheels automatically
Drop Python 3.3 for unbundled

We're targeting these changes at downstream re-distributors and it's
unlikely that one of them will be willing to have a new version of
pip without the most recent version of Python 3.
Drop PyPy from the de-bundling tests

PyPy isn't often packages by downstream, and even when it it is
it's often not got a pip package to go with it, and if it does
then it's probably not very likely that this code will fail on
PyPy but not on CPython 2.7.

So we'll just drop them so that the tests complete faster.
Move dev reqs from tox.ini to dev-requirements.txt

Then folks who don't use tox can do `pip install -r
dev-requirements.txt`

Since this is pip, which created the idea of requirements files, it
seems nice for the project to have one to showcase the idea.

Also cleaned up the tox.ini and made it more compact (fits now on my
laptop screen) and consistent.
Refactored PR to use url2pathname and pathname2url.
Only check for UNC path if url is not the Inf singleton.
Merge pull request #1834 from davidovich/fix_unc_path_windows

Add support for Windows UNC paths specified as --find-links
Typo fix
Enable parallelization of the Python 3.2 integration tests
Merge pull request #2225 from dstufft/fast-py32

Enable parallelization of the Python 3.2 integration tests
Displays info about [un]installed versions

Displays version when installing and uninstalling -- e.g.:

    Successfully installed pyrepl-0.8.4 pytest-2.6.4

and:

    Uninstalling pyrepl-0.8.4:
      Successfully uninstalled pyrepl-0.8.4
    Uninstalling pytest-2.6.4:
      Successfully uninstalled pytest-2.6.4
Ensure that Link().filename returns an unquoted filename