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.
Updated show command to return a status code
Make test_missing_argument expect error
Merge pull request #1 from msabramo/patch-2

Make test_missing_argument expect error
Separate pip freeze command from operation

By extracting the logic into pip.operations.freeze, the hope is that
folks could do a freeze programmatically more easily.
Reduce duplication of 'pypi.python.org'

by creating a PyPI object

Before:

    $ ag --ignore=_vendor 'pypi.python.org' pip
    pip/cmdoptions.py
    195:    default='https://pypi.python.org/simple/',

    pip/commands/search.py
    33:            default='https://pypi.python.org/pypi',

    pip/index.py
    305:            if page is None and 'pypi.python.org' not in str(main_index_url):
    706:                        ).netloc.endswith("pypi.python.org")):

    pip/utils/outdated.py
    107:                "https://pypi.python.org/pypi/pip/json",

After:

    $ ag --ignore=_vendor 'pypi.python.org' pip
    pip/index.py
    77:PyPI = Index(url='https://pypi.python.org/', trusted=True)
Merge pull request #2199 from msabramo/create_Index_class_and_PyPI_instance

Reduce duplication of "pypi.python.org"
Speed up unpack_file_url

by ignoring .tox, .git, .hg, .bzr, and .svn  when doing
`shutil.copytree` in unpack_file_url in pip/download.py.

Fixes: GH-2195
Merge pull request #2197 from svisser/patch-1

Updated show command to return a status code
Loosen filter regexes slightly

to catch a few messages that slipped through when I was installing
docutils on Python 3.4:

    warning: no files found matching 'MANIFEST'
    warning: no previously-included files matching '.cvsignore' found under directory '*'
    Skipping implicit fixer: buffer

Before:

    $ pip install ~/src/docutils --upgrade
    Processing /Users/marca/src/docutils
        warning: no files found matching 'MANIFEST'
        warning: no previously-included files matching '.cvsignore' found under directory '*'
        warning: no previously-included files matching '*~' found under directory '*'
        warning: no previously-included files matching '.DS_Store' found under directory '*'
    Installing collected packages: docutils
      Found existing installation: docutils 0.13
        Uninstalling docutils:
          Successfully uninstalled docutils
      Running setup.py install for docutils
        Skipping implicit fixer: buffer
        Skipping implicit fixer: idioms
        Skipping implicit fixer: set_literal
        Skipping implicit fixer: ws_comma
      ...

After:

    $ pip install ~/src/docutils --upgrade
    Processing /Users/marca/src/docutils
    Installing collected packages: docutils
      Found existing installation: docutils 0.13
        Uninstalling docutils:
          Successfully uninstalled docutils
      Running setup.py install for docutils
      ...