ddollar/heroku-config — pull request #12 by balvig (2013-10-08 07:30:21+00:00)
Title: Allow specifying which keys to pull/push

I had a situation where I only needed certain keys from the heroku config so added the option of selecting which keys to push/pull on the command line:

```
$ heroku config:pull DATABASE_URL RAILS_ENV
Pulls only DATABASE_URL and RAILS_ENV keys to .env
```