Install gcc 4.8 on travis for vega
Install gcc 4.8 on travis for vega

adsorensen/girder,data-exp-lab/girder,girder/girder,data-exp-lab/girder,adsorensen/girder,Xarthisius/girder,data-exp-lab/girder,jbeezley/girder,Kitware/girder,RafaelPalomar/girder,girder/girder,data-exp-lab/girder,Xarthisius/girder,Xarthisius/girder,sutartmelson/girder,kotfic/girder,sutartmelson/girder,RafaelPalomar/girder,adsorensen/girder,sutartmelson/girder,jbeezley/girder,RafaelPalomar/girder,RafaelPalomar/girder,Xarthisius/girder,Kitware/girder,girder/girder,manthey/girder,girder/girder,manthey/girder,kotfic/girder,adsorensen/girder,data-exp-lab/girder,jbeezley/girder,RafaelPalomar/girder,jbeezley/girder,Kitware/girder,sutartmelson/girder,kotfic/girder,Xarthisius/girder,kotfic/girder,manthey/girder,kotfic/girder,Kitware/girder,manthey/girder,adsorensen/girder,sutartmelson/girder