phinze/homebrew-cask — pull request #1661 by aah (2013-11-10 18:00:26+00:00)
Title: Exit with status of 1 on error

Fixes #393. Will rebase against master once changes from #1526 arrive.

Before:
```
~ $ brew cask install baz && brew cask install quux
Error: No available cask for baz
Error: No available cask for quux
```

After:
```
~ $ brew cask install baz && brew cask install quux
Error: No available cask for baz
~ $
```