Update package.xml
Fixed covar fill for raw_imu_bridge.  Added params for frame IDs and covar for ros_arduino_base but the covar still needs work.
Merge branch 'indigo-devel' of github.com:tonybaltovski/ros_arduino into indigo-devel
Broke up stdev param into x,y and yaw in ros_arduino_base.  Changed long to int32_t for clarity in ros_arduino_base firmware.