Change expected heroku page content

Heroku used to display a message that no app existed if there wasn't an app that
existed...now they display a message welcoming you to the new app whether it
exists or not. Not sure if this is supposed to be like this?
Merge pull request #504 from G5/heroku-spec-fix

Change expected heroku page content
Merge branch 'master' into spike-cloner-ui