Everything past here results in:

```
#    stack: not provided
FAIL SyntaxError: JSON.parse: unexpected character
#    type: uncaughtError
#    file: /Users/matt/Dropbox/Projects/localforage/test/test.drivers.coffee
#    error: JSON.parse: unexpected character
#           clone@file:///Users/matt/Dropbox/Projects/localforage/node_modules/grunt-casper/node_modules/casperjs/modules/utils.js:129
#           evaluate@file:///Users/matt/Dropbox/Projects/localforage/node_modules/grunt-casper/node_modules/casperjs/modules/casper.js:700
#           @file:///Users/matt/Dropbox/Projects/localforage/test/test.drivers.coffee:52
#           runStep@file:///Users/matt/Dropbox/Projects/localforage/node_modules/grunt-casper/node_modules/casperjs/modules/casper.js:1553
#           checkStep@file:///Users/matt/Dropbox/Projects/localforage/node_modules/grunt-casper/node_modules/casperjs/modules/casper.js:399
```

For slimerjs.