[api] Add options.hideEnv {key:boolean_hide,} to hide default env values

lib/forever/monitor.js

@@ -53,6 +53,7 @@ var Monitor = exports.Monitor = function (script, options) {
   this.sourceDir = options.sourceDir;
   this.cwd       = options.cwd || null;
   this.env       = options.env || {};
+  this.hideEnv       = options.hideEnv || {};
 
   //
   // Setup log files and logger for this instance.
@@ -361,23 +362,25 @@ Monitor.prototype.kill = function (forceStop) {
 //
 Monitor.prototype._getEnv = function () {
   var self   = this,
-      extra  = Object.keys(this.env),
       merged = {};
 
-  if (extra.length === 0) {
-    return process.env;
-  }
-
   function addKey (key, source) {
     merged[key] = source[key]
   }
-
+  
   //
   // Mixin the key:value pairs from `process.env` and the custom
   // environment variables in `this.env`.
   //
-  Object.keys(process.env).forEach(function (k) { addKey(k, process.env) });
-  extra.forEach(function (k) { addKey(k, self.env) });
+  for(var k in process.env) {
+    if(!self.hideEnv[k]) {
+      addKey(k, process.env);
+    }
+  }
+
+  for(var k in this.env) {
+    addKey(k, this.env);
+  }
 
   return merged;
 };