heroku/heroku — pull request #1009 by ys (2014-01-20 21:30:33+00:00)
Title: You can define a .heroku_default file containing a heroku app name

It will be the default app when you do not specify it with --app
There is a HEROKU_APP env option but using a .file can be easily
propagated against all your team machines.

example :

```
$ echo 'your_app_production' > /home/ys/src/your_app/.heroku_default
```