after it completes
This is the best that can probably be done.  Temporary directories are used
for get the svn binary version and to get the initial directory info (for
determining if one is, in fact, in a svn working directory)

ALSO: The check for SVN was not right.  Decided on files to only check for
.svn/entries because missing properties just leaves out the external refs.
And then incorporated a test on the code to make sure that svn info completed.

Test passed on CPytonh 2.x and 2.3 on windows, travis-ci, and travis-ci/mac.
Note: There seems to be an issue with pypy and a test.

--HG--
branch : setuptools
extra : amend_source : 73cc453f11a0b77f930138eee03b1fc8e69399af

Updated installation instructions, expanding on new techniques available to Windows 8 users and clarifying which technique Mac OS X users should use. Fixes #59.

Use zip files rather than tar files for source distributions of setuptools itself. Fixes #7 for users of Python 2.7.4 and later.

--HG--
extra : source : 81bfac3cf9a11fbb52b43cb3106419085ac8aee5
extra : histedit_source : 942f45916acfe482998d0cb7adefc08f095dcf0c

branching to 0.7 now, as I wanted this wart gone before anything went
into Python 2.5.  But it's gone now, yay!

--HG--
extra : source : f3c5c19842064dd4a497baef0171aac54464a484
extra : amend_source : 3f79e71eedfc5f37a1813967bb53cf9d92a11919