now using bash for everything

ts/npmci.test.ts

@@ -1,14 +1,16 @@
 import "typings-global";
 import * as plugins from "./npmci.plugins";
+import {bash} from "./npmci.bash";
 import {install} from "./npmci.install";
+
 export let test = (versionArg) => {
     let done = plugins.q.defer();
     install(versionArg)
         .then(function(){
             plugins.beautylog.info("now installing dependencies:");
-            plugins.shelljs.exec("npm install");
+            bash("npm install");
             plugins.beautylog.info("now starting tests:");
-            plugins.shelljs.exec("npm test");
+            bash("npm test");
             plugins.beautylog.success("test finished");
             done.resolve();
         })