travis: add Go 1.5
travis: add Go 1.5

firebitsbr/tsuru,gciotta/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,guilhermebr/tsuru,hcxiong/tsuru,kgrvamsi/tsuru,ArxdSilva/tsuru,4eek/tsuru,tuxmonteiro/tsuru,Endika/tsuru,gciotta/tsuru,firebitsbr/tsuru,gwmoura/tsuru,guilhermebr/tsuru,gwmoura/tsuru,gciotta/tsuru,guilhermebr/tsuru,cgvarela/tsuru,Endika/tsuru,4eek/tsuru,cgvarela/tsuru,guilhermebr/tsuru,tuxmonteiro/tsuru,4eek/tsuru,cgvarela/tsuru,tsuru/tsuru,tuxmonteiro/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,firebitsbr/tsuru,kgrvamsi/tsuru,Endika/tsuru,cezarsa/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,tsuru/tsuru,kgrvamsi/tsuru,tsuru/tsuru,tsuru/tsuru,ggarnier/tsuru,ggarnier/tsuru,gwmoura/tsuru,cezarsa/tsuru,hcxiong/tsuru,ggarnier/tsuru