fix for #271 add proxy with auth, based on http://stackoverflow.com/questions/34079/how-to-specify-an-authenticated-proxy-for-a-python-http-connection
fix for #271 add proxy with auth, based on http://stackoverflow.com/questions/34079/how-to-specify-an-authenticated-proxy-for-a-python-http-connection

allenh1/rosdep,spaghetti-/rosdep,spaghetti-/rosdep,alessandro-aglietti/rosdep,georgepar/rosdep,aymanim/rosdep,alessandro-aglietti/rosdep,aymanim/rosdep,sorki/rosdep,ros-infrastructure/rosdep,sorki/rosdep,allenh1/rosdep,georgepar/rosdep,ros-infrastructure/rosdep,wkentaro/rosdep,wkentaro/rosdep