chore(package): update steal to version 2.1.7

Closes #151

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "detect-cyclic-packages": "^1.1.0",
     "jquery": "^3.1.1",
     "jshint": "^2.7.0",
-    "steal": "^1.0.0",
+    "steal": "^2.1.7",
     "steal-qunit": "^1.0.0",
     "steal-tools": "^1.0.0",
     "testee": "^0.8.0"