ignition-math4: new formula (#288)
ignition-math4: new formula (#288)

* ignition-math4: new formula

* ignition-math4 3.999.999~20170906~cb9a1e9 sierra bottle

* ignition-math4 3.999.999~20170906~cb9a1e9 el_capitan bottle

* ignition-math4 3.999.999~20170906~cb9a1e9 high_sierra bottle

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