expose anonymous constant as heroku variable
expose anonymous constant as heroku variable

this keeps it consistent with the other constants
in app.constants.json

F51-272

Four51/demo_buyer,spencerwalker/angular-buyer,Four51/demo_buyer,ordercloud-api/angular-buyer,crhistianr/angular-buyer,ordercloud-api/angular-buyer,crhistianr/angular-buyer,spencerwalker/angular-buyer