[gazebo_ros] Fix for #246

Fixing issue #246 in gzserver.
Merge branch 'indigo-devel' into patch-1
Extended the fix for #246 also to debug, gazebo, gzclient and perf scripts.
Merge pull request #247 from peci1/patch-1

[gazebo_ros] Fix for #246
move declaration for DefaultRobotHWSim to header file
Merge pull request #266 from ipa-fxm/introduce_header_for_default_robot_hw_sim

[gazebo_ros_control] move declaration for DefaultRobotHWSim to header file
Update CMakeLists.txt
Merge pull request #271 from jhu-lcsr-forks/indigo-devel

gazebo_plugins: Adding ogre library dirs to cmakelists