chore(package): update steal to version 2.1.6

Closes #118

Author: greenkeeper[bot]

package.json

@@ -71,7 +71,7 @@
     "detect-cyclic-packages": "^1.1.0",
     "http-server": "^0.10.0",
     "jshint": "^2.9.1",
-    "steal": "^1.2.10",
+    "steal": "^2.1.6",
     "steal-qunit": "^1.0.1",
     "test-saucelabs": "0.0.3",
     "testee": "^0.8.0"