(https://github.com/jsk-ros-pkg/jsk_model_tools/issues/18) euscollada/sr...

...c/collada2eus_urdfmodel.cpp : do not overwrite sensor methods
This is the same update to collada2eus_urdfmodel.cpp,  
https://github.com/jsk-ros-pkg/jsk_model_tools/commit/040aa3979538f694498c26bdc2eb0e90460c40a1#diff-564d74fac28cf8b501fc2eb81a69a255