reduce build overhead in travis
reduce build overhead in travis

roxyboy/cython,scoder/cython,fperez/cython,hickford/cython,dahebolangkuan/cython,JelleZijlstra/cython,da-woods/cython,acrispin/cython,fabianrost84/cython,madjar/cython,hickford/cython,JelleZijlstra/cython,hhsprings/cython,fperez/cython,scoder/cython,madjar/cython,fperez/cython,dahebolangkuan/cython,c-blake/cython,acrispin/cython,mcanthony/cython,achernet/cython,dahebolangkuan/cython,c-blake/cython,mrGeen/cython,JelleZijlstra/cython,mcanthony/cython,madjar/cython,c-blake/cython,fabianrost84/cython,mcanthony/cython,achernet/cython,achernet/cython,ChristopherHogan/cython,slonik-az/cython,scoder/cython,JelleZijlstra/cython,encukou/cython,cython/cython,JelleZijlstra/cython,slonik-az/cython,marscher/cython,ABcDexter/cython,andreasvc/cython,mrGeen/cython,ABcDexter/cython,slonik-az/cython,da-woods/cython,ABcDexter/cython,madjar/cython,fperez/cython,slonik-az/cython,hickford/cython,madjar/cython,andreasvc/cython,fabianrost84/cython,roxyboy/cython,ChristopherHogan/cython,dahebolangkuan/cython,achernet/cython,da-woods/cython,hickford/cython,encukou/cython,ChristopherHogan/cython,c-blake/cython,marscher/cython,dahebolangkuan/cython,roxyboy/cython,encukou/cython,marscher/cython,encukou/cython,andreasvc/cython,c-blake/cython,mrGeen/cython,mrGeen/cython,achernet/cython,hhsprings/cython,roxyboy/cython,ABcDexter/cython,mrGeen/cython,acrispin/cython,cython/cython,andreasvc/cython,cython/cython,acrispin/cython,acrispin/cython,fabianrost84/cython,andreasvc/cython,mcanthony/cython,scoder/cython,hickford/cython,marscher/cython,mcanthony/cython,da-woods/cython,encukou/cython,roxyboy/cython,hhsprings/cython,fperez/cython,ABcDexter/cython,hhsprings/cython,hhsprings/cython,slonik-az/cython,marscher/cython,cython/cython,fabianrost84/cython