rtt_gazebo_activity: added GazeboActivity that gets triggered by RTTSystem::clockUpdate()
rtt_gazebo_activity: added gazebo service
rtt_gazebo_activity: only use gazebo time if /use_sim_time parameter is set to true
rtt_gazebo_activity: added missing dependency to roscpp
rtt_gazebo_activity: reset the Logger's reference time when switching to Gazebo time
gazebo_activity: added header install rule
rtt_gazebo_activity: added build and run dependency to rtt_rosgraph_msgs
rtt_gazebo_activity: removed find_package(Orocos-KDL REQUIRED) from CMakeLists.txt as KDL is not used in rtt_gazebo_activity

These lines have been added during the merge in https://github.com/jhu-lcsr/rtt_gazebo/commit/f3b99b76a1404b46ea66bd15f0dd02e5e7b25fba.
Merge remote-tracking branch 'meyerj/removed-orocos-kdl-from-rtt-gazebo-activity'
rtt_gazebo_plugin: updated CMakeLists.txt to use orocos_kdl instead of Orocos-KDL to find KDL
Merge pull request #12 from meyerj/removed-orocos-kdl-from-rtt-gazebo-activity

Removed find_package(Orocos-KDL REQUIRED) from rtt_gazebo_activity/CMakeLists.txt
Merge pull request #14 from meyerj/orocos_kdl_renaming

Orocos kdl renaming
Merging in changes from @meyerj
Merge branch 'master' of github.com:jhu-lcsr/rtt_gazebo