Fix cmake file while building with install option

[murikill]

Nodelet error occurs, when the package was built with install option.

Please add following lines to the cmake file:

install(
  FILES nodelets.xml
  DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
)

[simonkerscher]

PR with this change is here: #75

[yangfanFred]

Hi Muri and Simon,

Thanks for the fix PR, we will test and update codes.

Thanks,
Fred