Fixed issue with container loading old version of simplewebapp.

Added "heroku.yml".

NOTE: to fix issue with ghosting do: pkill -f container
4 jobs for master in 51 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed build-job #490137

00:00:08

 
  Test
passed test-job #490138

00:00:07

 
  Deploy Staging
passed deploy-test #490139

00:00:08

 
  Deploy
passed deploy-prod #490140

00:00:26