allow console.warn and console.error

tslint.json

@@ -6,6 +6,7 @@
         "indent": [true, "spaces"],
         "quotemark": [true, "single"],
         "max-line-length": [true, 80],
-        "prefer-const": true
+        "prefer-const": true,
+        "no-console": ["log", {"allow": ["warn", "error"]}]
     }
 }