Allow overriding flowdock api url from env
Allow overriding flowdock api url from env

jaisonerick/heaven,markpundsack/heaven,ngpestelos/heaven,maletor/heaven,ackimwilliams/heaven,pulibrary/heaven,dLobatog/heaven,TailorDev/heaven,ResultadosDigitais/newrelic_notifier,ngpestelos/heaven,sharetribe/heaven,sharetribe/heaven,eLobato/heaven,travis-ci/heaven,rothsa/heaven,shift/heaven,TailorDev/heaven,digideskio/heaven,atmos/heaven,sharetribe/heaven,waysact/heaven,n3tr/heaven,ResultadosDigitais/heaven,dLobatog/heaven,digideskio/heaven,getsentry/heaven,digideskio/heaven,maletor/heaven,pulibrary/heaven,ResultadosDigitais/heaven,waysact/heaven,ResultadosDigitais/newrelic_notifier,rothsa/heaven,travis-ci/heaven,kidaa/heaven,rnaveiras/heaven,pulibrary/heaven,flowdock/heaven,ResultadosDigitais/newrelic_notifier,shift/heaven,dLobatog/heaven,kidaa/heaven,jaisonerick/heaven,flowdock/heaven,shift/heaven,cloudy9101/heaven,ackimwilliams/heaven,eLobato/heaven,rothsa/heaven,atmos/heaven,markpundsack/heaven,ResultadosDigitais/heaven,n3tr/heaven,flowdock/heaven,maletor/heaven,ackimwilliams/heaven,waysact/heaven,eLobato/heaven,n3tr/heaven,cloudy9101/heaven,jaisonerick/heaven,markpundsack/heaven,rnaveiras/heaven,ngpestelos/heaven,travis-ci/heaven,LoveMondays/heaven,getsentry/heaven,rnaveiras/heaven,atmos/heaven,cloudy9101/heaven,LoveMondays/heaven,LoveMondays/heaven,TailorDev/heaven,kidaa/heaven