parsing /proc/[pid]/stat fails if a process name contains a space

```javascript
process.title = process.argv[2] || ':-) 1 2 3 4 5 6';

require('fs').readFile('/proc/'+process.pid+'/stat', 'utf8', console.log);
require('usage').lookup(process.pid, console.log);
```

In the example above /proc/[pid]/stat starts with this: `7014 (:-) 1 2 3 4 5 6) R 5963 7014 5963 ...` and data.split(' ') parses that one incorrectly.