ignore cd path echo when using CDPATH, which breaks catkin usage

see http://superuser.com/questions/90535/how-do-i-turn-of-auto-echo-in-bash-when-i-cd
reset CATKIN_SHELL in devel space generated env.sh files (fix #652)
Merge pull request #655 from ros/reset_shell

reset CATKIN_SHELL in devel space generated env.sh files
Merge pull request #654 from rhaschke/indigo-devel

ignore cd path echo when using CDPATH, which breaks catkin usage
reset CATKIN_SHELL in devel space generated env.sh files, second location (#655)
add --no-push to catkin_prepare_release
Merge pull request #657 from ros/no_push

add --no-push to catkin_prepare_release
flush stdin before asking for input
Merge pull request #658 from ros/flush_stdin

flush stdin before asking for input
update changelog
0.6.7
fix CMake warning for doxygen target with CMake 3 (fix #660)
make nosetests --xunit-file argument an absolute path to work around nose bug 779 (fix #659)
Merge pull request #662 from ros/nosetests_abs_xunit_file

make nosetests --xunit-file argument an absolute path to work around nose bug 779
Merge pull request #661 from ros/doxygen_warning_cmake3

fix CMake warning for doxygen target with CMake 3