Log Message:
Update py-libwww to 6.15:

2015-12-15  Release 6.15
    (special thanks to Chase Whitener for testing many of these changes out in
    6.14_001!)

Graham Knop (1):
    - tests now use localhost rather than a net-accessible address (PR#76)

Michael Schwern (1):
    - fixed some tests to do what they intended (regex rather than boolean
      checks) (from PR#28)

Joe Atzberger (2):
    - conversion of some tests from Test.pm to Test::More (from PR#29)

Piotr Roszatycki (1):
    - use File::Temp for randomized tempdir (PR#53)