adrienverge / yamllint / 476

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Better color support check.

Not all systems have `isatty` attribute on `sys.stdout` so check for
existance of attribute before checking value. Also don't use color in
Windows unless environ indicates support. Apparently, Windows can indicate
support by either the presence of `ANSICON` environ variable or if the
`TERM` environ variable is set to `ANSI`. Fixes #79.

No additional tests added, as the relevant tests use fcntl, which is a
Unix only lib. In fact, the tests won't even run in Windows.

6 of 6 new or added lines in 1 file covered. (100.0%)

919 of 937 relevant lines covered (98.08%)

6.72 hits per line