Updated flatiron dependency to 0.2.8

This way it's possible to install forever on box that only has access to npm.

Flatiron 0.2.3 depends on prompt 0.2.2, that depends on read this way:

```
    "read": "https://github.com/indexzero/read/tarball/refactor-optional-streams",
```

package.json

@@ -21,7 +21,7 @@
   ],
   "dependencies": {
     "cliff": "0.1.8",
-    "flatiron": "0.2.3",
+    "flatiron": "0.2.8",
     "forever-monitor": "1.0.2",
     "nconf": "0.6.1",
     "nssocket": "0.3.8",