update docs and comments, add servezone compatibility

dist/npmci.publish.d.ts

@@ -1,4 +1,12 @@
 /// <reference types="q" />
 import "typings-global";
 import * as plugins from "./npmci.plugins";
-export declare let publish: (serviceArg?: string) => plugins.q.Promise<{}>;
+/**
+ * type of supported services
+ */
+export declare type registryService = "npm" | "docker";
+/**
+ * the main exported publish function.
+ * @param registryServiceArg the serviceArg
+ */
+export declare let publish: (registryServiceArg?: registryService) => plugins.q.Promise<{}>;