[refactor] Implement pass-through options for child

Depends on indexzero/nconf#17.

lib/forever/cli.js

@@ -160,8 +160,31 @@ function checkColumn(name) {
 //
 function getOptions(file) {
   var options = {};
-  options.pidFile = app.config.get('pidFile');
-  options.logFile = app.config.get('logFile');
+  //
+  // First isolate options which should be passed to file
+  //
+  options.options = process.argv.splice(process.argv.indexOf(file) + 1);
+
+  //
+  // Now we have to force optimist to reparse command line options because
+  // we've removed some before.
+  //
+  app.config.system.loadArgv();
+
+  var o = [
+        'pidFile', 'logFile', 'errFile', 'watch', 'minUptime', 'appendLog',
+        'silent', 'max', 'command', 'path', 'spinSleepTime', 'sourceDir',
+        'uid'
+      ];
+  o.forEach(function (key) {
+    options[key] = app.config.get(key);
+  });
+
+  options.sourceDir = file && file[0] !== '/' ? process.cwd() : '/';
+  if (options.sourceDir) {
+    options.spawnWith = {cwd: options.sourceDir};
+  }
+
   return options;
 }