heroku commands

Add new heroku remote ( if you rename an app in heroku run this step before renaming remotes)
heroku git:remote -a [app name].

Add remote with name
heroku git:remote -a [app name] -r [remote] 
exmaple: heroku git:remote -a erock-dot-dev-staging -r staging

Remove heroku remote
git remote rm [remote name]

Push non master branch to heroku environment 
git push [remote] [branch]:master
example: git push staging develop:master

Notes on creating multiple environments: https://devcenter.heroku.com/articles/multiple-environments