The resource_retriever package's source was moved into
its own repository, and needs now python-urlgrabber.
Hence, this commit provides the recipe for python-urlgrabber, moves
the resource-retriever to its own location, and updates all other
packages in the robot_model repository.

Due to changes in the package.xml of the updated version, this
commit adjusts LIC_FILES_CHKSUM.

Due to changes in the package.xml, this commit adjusts the
LIC_FILES_CHKSUM.

Updating pcl-conversions to 0.2.0 needs adjusting of the LIC_FILES_CHKSUM line.

The patch to dwa_local_planner has been incorporated in version
1.12.3, and hence is removed here.

Updating laser-geometry to 1.6.2 needed adjusting of the
LIC_FILES_CHKSUM line.

Due to the update, imu-pipeline contains now two ROS packages and
requires patching to build if CATKIN_ENABLE_TESTING is not enabled.

Due to the update, this commits also adds new dependencies.

The patch provided upstream is incorporated since 1.11.4 and hence
is removed.

The recent geometry_experimental repository also provides the
tf2_sensor_msgs package, which is needed for the recent
imu_pipeline packages.

Due to the update to 0.4.3, this commit adjusts the pointer to
the license line.

The smach_ros package added rostest test case, and now depends on
rostest, and hence, this commit also adds the dependency to the
recipe.

The package update from 0.1.7 to 0.1.8 requires adjusting the
line of the LIC_FILES_CHKSUM.

Due to the update, class-loader now depends on cmake-modules.