Pause switch now enables/disables carousel servo
Changed persistant to persistent. Ugh.
Created dynamixel_test node and launch files

These are intended for testing features on new MX series dynamixels.
Specifically, features not implemented yet in the ROS dynamixel drivers.
Created srv dir for manipulator, and new srv msg.
Modified the command to manipulator, added fields.
Modified Cmake to include TorqueStandoff.srv
Corrected spelling in logging messages.
Changed dynamixel test files.

dynamixel_test_node is no longer necessary to access test dynamixel
services, so it was deleted.  The .yaml file and .launch file now
load 2 instances of a ManipulatorJointController.
Corrected setup.py to define manipulator package.
Updated manipulator service messages.
Modified CMakeLists to include new service msgs.
New dynamixel controller class for manipulator.

This class has services that simplify the control of the
dynamixels in the manipulator.   The services block until the
specified action is complete.
Added grip_torque to grab action.
New config files for manipulator.
New manipulator node and state machine.
Removed import of manipulator_data.py
Removed . from ./ in ignore file.
Merged mx_controller branch into SampleReturn
Merge branch 'manipulator_and_carousel'