bin: Exit with the number of "suggestions"

This patch makes the binary (`write-good(1)`) a bit more "unixy".  The
prior implementation exited with `0` unless a runtime error occurred.

Now running this:

```sh
$ bin/write-good.js README.md > /dev/null && echo "hi"
```

Should not output "hi".
Update to jasmine-node 2.0

Update write-good to use newest version of jasmine-node
Merge pull request #34 from duereg/patch-2

Update to jasmine-node 2.0
Merge pull request #30 from stephenmathieson/fix/exit-code

bin: Exit with the number of "suggestions"
Merge pull request #32 from bamos/master

Synchronize command line opts with function opts.
0.8.0
Fix Zoolander quote.