Don't output color on windows or when stdout is redirected.
Don't output color on windows or when stdout is redirected.

* build/run_tests.py
  (TextColor.disable): New.
  (TestHarness.__init__): Disable colors in some circumstances.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion