.travis.yml: enabled containers mode (for faster builds)
.travis.yml: enabled containers mode (for faster builds)

playpauseandstop/aiohttp,moden-py/aiohttp,elastic-coders/aiohttp,flying-sheep/aiohttp,jettify/aiohttp,jashandeep-sohi/aiohttp,z2v/aiohttp,moden-py/aiohttp,decentfox/aiohttp,arthurdarcet/aiohttp,pfreixes/aiohttp,vaskalas/aiohttp,Srogozins/aiohttp,decentfox/aiohttp,juliatem/aiohttp,hellysmile/aiohttp,avanov/aiohttp,vaskalas/aiohttp,esaezgil/aiohttp,jettify/aiohttp,panda73111/aiohttp,esaezgil/aiohttp,vaskalas/aiohttp,KeepSafe/aiohttp,rutsky/aiohttp,arthurdarcet/aiohttp,singulared/aiohttp,esaezgil/aiohttp,rutsky/aiohttp,KeepSafe/aiohttp,moden-py/aiohttp,jashandeep-sohi/aiohttp,panda73111/aiohttp,jettify/aiohttp,juliatem/aiohttp,KeepSafe/aiohttp,Insoleet/aiohttp,z2v/aiohttp,hellysmile/aiohttp,z2v/aiohttp,decentfox/aiohttp,elastic-coders/aiohttp,alex-eri/aiohttp-1,AraHaanOrg/aiohttp,Eyepea/aiohttp,pfreixes/aiohttp,rutsky/aiohttp,singulared/aiohttp,singulared/aiohttp,panda73111/aiohttp,alex-eri/aiohttp-1,mind1master/aiohttp,arthurdarcet/aiohttp,alex-eri/aiohttp-1,mind1master/aiohttp,elastic-coders/aiohttp,mind1master/aiohttp,AraHaanOrg/aiohttp,jashandeep-sohi/aiohttp