add package-lock.json and use lerna

package-lock.json

+{
+	"name": "cobox-constants",
+	"version": "1.0.3",
+	"lockfileVersion": 1,
+	"requires": true,
+	"dependencies": {
+		"os": {
+			"version": "0.1.1",
+			"resolved": "https://registry.npmjs.org/os/-/os-0.1.1.tgz",
+			"integrity": "sha1-IIhF6J4ZOtTZcUdLk5R3NqVtE/M="
+		}
+	}
+}