config/deploy.rb - config settings not assigned

deploy.rb like this:

```
application = "signal"
repository = 'git://github.com/dcrec1/signal.git'
hosts = ['hooters', 'geni']
```

... wouldn't take any effect.

While this:

```
@application = "signal"
@repository = 'git://github.com/dcrec1/signal.git'
@hosts = ['hooters', 'geni']
```

... does work.
