chore(package): update steal to version 2.1.11

Closes #54

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "detect-cyclic-packages": "^1.1.0",
     "http-server": "^0.11.0",
     "jshint": "^2.9.5",
-    "steal": "^1.5.14",
+    "steal": "^2.1.11",
     "steal-qunit": "^1.0.0",
     "steal-tools": "^1.9.0",
     "testee": "^0.8.0"