chore(package): update steal to version 2.2.4

Closes #284

Author: greenkeeper[bot]

package.json

@@ -80,7 +80,7 @@
     "gh-pages": "^2.0.1",
     "highlight.js": "^9.15.7",
     "jshint": "^2.9.1",
-    "steal": "^1.0.0",
+    "steal": "^2.2.4",
     "steal-qunit": "^2.0.0",
     "steal-tools": "^1.0.1",
     "testee": "^0.9.0"