message: FIX: Use correct stone inertia tensor for Gazebo stone
  m = V * rho
  V = w * h * d
  w = 25mm
  d = 32mm
  h = 64mm
  m = 25e-3 * 32e-3 * 64e-3 * 2000 = 0.1024 kg
  See
diff: <!--NOTE: Uses limestone density (i.e 2000 kg/m^3) to calculate the mass
  see https://en.wikipedia.org/wiki/Limestone
  -->
  - <mass>0.08192</mass>
  + <mass>0.1024</mass>
  <inertia>
  - <ixx>0.01</ixx>
  + <ixx>4.369e-5</ixx>
  <ixy>0</ixy>
  <ixz>0</ixz>
  - <iyy>0.01</iyy>
  + <iyy>4.028e-5</iyy>
  <iyz>0</iyz>
  - <izz>0.01</izz>
  + <izz>1.407e-5</izz>
  </inertia>
  <pose>0 0 0 0 -0 0</pose>
  </inertial>
  