Build: Drop the direct grunt-cli dependency

`grunt` already includes `grunt-cli`; no need to specify it directly.

Author: mgol

package-lock.json

@@ -55,7 +55,6 @@
 		"express-body-parser-error-handler": "1.0.7",
 		"globals": "15.2.0",
 		"grunt": "1.6.1",
-		"grunt-cli": "1.4.3",
 		"grunt-compare-size": "0.4.2",
 		"grunt-contrib-concat": "2.1.0",
 		"grunt-contrib-uglify": "5.2.2",