Log Message:
Update 1.72 to 1.73
1.73        2013-08-24
========================================
[TESTS]

- Update t/local/back.t to use LocalServer for 404 checking to avoid fails
on win32. Fix by Matt S Trout, patient diagnostics and testing provided
by jayefuu of freenode #perl

- Blow away more proxy env vars in LocalServer, and do it on load so that
the LWP env checking doesn't happen before we've done it.

[OTHER CHANGES]

- Better error when passing only one parameter to follow_link