flake8 added to Travis-CI
flake8 added to Travis-CI

mugurrus/eve,sebest/eve,elpoisterio/eve,stratosgear/eve,amagdas/eve,eduardomb/eve,superdesk/eve,hustlzp/eve,jzorrof/eve,kidaa/eve,kalbasit/eve,bcrochet/eve,yanyanqin/eve,opticode/eve,matthieuprat/eve,mcreenan/eve,pjs7678/eve,kynan/eve,EasonYi/eve,julianhille/eve