Added unwatchFile method for issue-551

src/filesystem/interface.js

@@ -17,6 +17,7 @@ var providers = require('../providers/index.js');
 var Shell = require('../shell/shell.js');
 var Intercom = require('../../lib/intercom.js');
 var FSWatcher = require('../fs-watcher.js');
+//var unwatcher = require('../unwatcherFile.js');
 var Errors = require('../errors.js');
 var defaultGuidFn = require('../shared.js').guid;
 
@@ -159,6 +160,27 @@ function FileSystem(options, callback) {
     return watcher;
   };
 
+  this.unwatchFile = function(filename, listener) {
+    if(isNullPath(filename)) {
+      throw new Error('Path must be a string without null bytes.');
+    }
+    listener = listener || nop;
+
+    if(listener == nop){
+      this.removeAllListeners();
+    }
+    else{
+      this.off('change', listener);
+    }
+    /*var unwatch = new unwatchFile();
+    if(listener == nop){
+      unwatch.removeListeners();
+    }
+    else{
+      unwatch.removeSingleListener(listener);
+    }*/
+  };
+
   // Deal with various approaches to node ID creation
   function wrappedGuidFn(context) {
     return function(callback) {