build: add leak checking in tests

Author: dougwilson

package.json

@@ -25,16 +25,16 @@
   },
   "devDependencies": {
     "istanbul": "0.2.10",
-    "mocha": "~1.20.0",
+    "mocha": "~1.20.1",
     "supertest": "~0.13.0",
-    "should": "~4.0.0"
+    "should": "~4.0.1"
   },
   "engines": {
     "node": ">= 0.8.0"
   },
   "scripts": {
-    "test": "mocha --reporter dot",
-    "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --reporter dot",
-    "test-travis": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --reporter spec"
+    "test": "mocha --check-leaks --reporter dot",
+    "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --check-leaks --reporter dot",
+    "test-travis": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --check-leaks --reporter spec"
   }
 }