Correct missing const modifier on msg param (fix #15).
Add install targets for simple_message, industrial_robot_client, industrial_utils and industrial_deprecated.

These packages were missing proper install targets, causing problems when trying to use these in an 'install space'.
Merge pull request #16 from gavanderhoorn/issue15_deprecated_conversion_simplemessage

Fix issue #15 (missing const modifier)
Merge pull request #18 from gavanderhoorn/issue8_missing_install_targets

Fix issue #8 (missing install targets)