new gazebo_ros_control_plugin supporting multiple hardwareinterfaces and switch on controller_switching
correctly reset all interfaces in doSwitchHWInterface
add README for new plugin
Update README.md
Update README.md
ignore 'robotSimType'
unify ROS STREAM output
remove support for X_PID control_methods for simplicity (obsolete anyway)
Merge pull request #1 from ipa-fxm/indigo_dev

[Indigo] Initial version GazeboRosControlPlugin with Multi-HWInterface-Support