hector_quadrotor_model: fixed sign of aerodynamic forces
Merge branch 'hydro-devel' into ros_control
hector_quadrotor_controller: removed header file pose_controller.h
hector_quadrotor_controller/hector_quadrotor_controller_gazebo: several updates

* twist_controller: transform cmd_vel commands during update instead of callback
* twist_controller: control nav frame angular z rate
* pid: fetch time_constant parameter from parameter server
* hector_quadrotor_controller_gazebo: publish applied wrench as WrenchStamped instead of Wrench
* hector_quadrotor_controller_gazebo: filter derived acceleration from gazebo/state subscriber
hector_quadrotor_controller: updated control parameters