Moved the calibration file and the launch file to the bringup package.

launch/bno055_imu.launch

-<launch>
-
-  <!-- launch the action client node -->
-  <node name="bno055_imu"
-        pkg="bno055_imu"
-        type="bno055_imu"
-        output="screen">
-    <param name="update_rate" value="1"/>
-    <param name="serial_device" value="/dev/ttyUSB1"/>
-    <param name="cal_filename" value="$(find bno055_imu)/calibration/bno055.cal"/>
-    <param name="tf_prefix" value=""/>
-    <param name="frame_id" value="imu"/>
-  </node>
-
-</launch>
-