Consult tput about color control sequence support

Blocking these sequences on Darwin has false positives (Terminal.app)
and false negatives (Eclipse CDT on Linux).  Instead let's ask the
terminal what it supports.

Change-Id: I907942925a8b30abc1ea920f077b5fc3af815ba4
Signed-off-by: Greg Hackmann <ghackmann@google.com>
1 file changed