update docs and comments, add servezone compatibility

dist/npmci.ssh.d.ts

@@ -1,4 +1,7 @@
 /// <reference types="q" />
 import "typings-global";
 import * as plugins from "./npmci.plugins";
+/**
+ * checks for ENV vars in form of NPMCI_SSHKEY_* and deploys any found ones
+ */
 export declare let ssh: () => plugins.q.Promise<{}>;