RiotGames/berkshelf — pull request #824 by sethvargo (2013-08-30 13:23:47+00:00)
Title: Accept an environment variable to debug solve

```text
$ DEBUG_RESOLVER=1 berks install
```

RiotGames/solve#27

```ruby
class StupidUI
def say(message)
puts message
end
end
```

/cc @jtimberman @andrewGarson