Add deployment SHA to Heroku Build version
Add deployment SHA to Heroku Build version

Adding the SHA to the build "version" allows things like checking what's
currently not deployed, or checking if a branch is currently "locking"
our app.

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