ignition-gazebo3 3.0.0~pre2 (#911)
ignition-gazebo3 3.0.0~pre2 (#911)

* ignition-gazebo3: update 3.0.0~pre2

* ignition-gazebo3: update 3.0.0~pre2 bottle.

j-rivero/homebrew-simulation,scpeters/homebrew-simulation,osrf/homebrew-simulation