ignore cd path echo when using CDPATH, which breaks catkin usage #654
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cd'ing echos the reached directory to the console when the CDPATH environment variable is used
This breaks the extraction of _CATKIN_SETUP_DIR, because now the directory is listed twice!
see http://superuser.com/questions/90535/how-do-i-turn-of-auto-echo-in-bash-when-i-cd