Upgrade to coverage 3.7.1 and have it auto-build itself on first use.

third_party/coverage-3.6/doc/install.rst

Index: third_party/coverage-3.6/doc/install.rst
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-.. _install:
-
-============
-Installation
-============
-
-:history: 20100725T225600, new for 3.4.
-:history: 20100820T151500, updated for 3.4b1.
-:history: 20100906T134800, updated for 3.4b2.
-:history: 20110604T213400, updated for 3.5b1.
-:history: 20110629T082400, updated for 3.5.
-:history: 20110923T081900, updated for 3.5.1.
-:history: 20120429T162500, updated for 3.5.2b1.
-:history: 20120503T234000, updated for 3.5.2.
-:history: 20120929T093600, updated for 3.5.3.
-:history: 20121117T095000, Now setuptools is a pre-req.
-:history: 20121128T203000, updated for 3.6b1.
-:history: 20121223T180800, updated for 3.6b2.
-:history: 20121229T112400, updated for 3.6b3.
-:history: 20130105T174400, updated for 3.6.
-
-
-.. highlight:: console
-.. _coverage_pypi: http://pypi.python.org/pypi/coverage
-.. _setuptools: http://pypi.python.org/pypi/setuptools
-.. _Distribute: http://packages.python.org/distribute/
-
-
-Installing coverage.py is done in the usual ways. You must have `setuptools`_
-or `Distribute`_ installed already, and then you:
-
-#.  Download the appropriate kit from the
-    `coverage page on the Python Package Index`__.
-
-#.  Run ``python setup.py install``.
-
-or, use::
-
-    $ pip install coverage
-
-or even::
-
-    $ easy_install coverage
-
-.. __: coverage_pypi_
-
-
-Installing from source
-----------------------
-
-Coverage.py includes a C extension for speed. If you are installing from source,
-you may need to install the python-dev support files, for example with::
-
-    $ sudo apt-get install python-dev
-
-
-Installing on Windows
----------------------
-
-For Windows, kits are provided on the `PyPI page`__ for different versions of
-Python and different CPU architectures. These kits require that `setuptools`_ be
-installed as a pre-requisite, but otherwise are self-contained.  They have the
-C extension pre-compiled so there's no need to worry about compilers.
-
-.. __: coverage_pypi_
-
-
-Checking the installation
--------------------------
-
-If all went well, you should be able to open a command prompt, and see
-coverage installed properly::
-
-    $ coverage --version
-    Coverage.py, version 3.6.  http://nedbatchelder.com/code/coverage
-
-You can also invoke coverage as a module::
-
-    $ python -m coverage --version
-    Coverage.py, version 3.6.  http://nedbatchelder.com/code/coverage