Test adjustments and improvements.

* Reducing code duplication
* Using import destructuring.
* Ignoring integration test file output.
* Changing package 'test' script to not use hashbang execution.
* Explicitly requiring jake rather than relying on global import
* Fixing integration tests to run on Windows.
* Fixing no-sparse-arrays eslint error.
* Fixing assertion param ordering
* Making test tmp dir deletion/creation easier.

Author: Tzrlk

lib/task/task.js

@@ -420,7 +420,7 @@ class Task extends EventEmitter {
 
   _getParams() {
     if (!this.action) return "";
-    let params = (new RegExp('(?:'+this.action.name+'\\s*|^)\\s*\\((.*?)\\)').exec(this.action.toString().replace(/\n/g, '')) || [,''])[1].replace(/\/\*.*?\*\//g, '').replace(/ /g, '');
+    let params = (new RegExp('(?:'+this.action.name+'\\s*|^)\\s*\\((.*?)\\)').exec(this.action.toString().replace(/\n/g, '')) || [''])[1].replace(/\/\*.*?\*\//g, '').replace(/ /g, '');
     return params;
   }