Added support for symlink

[asafsemo]

I update the code to support symlink files.
If the folder includes symlink it will follow and monitor the pointed file.

func (w *Watcher) list(name string) (map[string]os.FileInfo, error) {
fileList := make(map[string]os.FileInfo)

// Make sure name exists.
stat, err := os.Stat(name)
if err != nil {
	return nil, err
}

fileList[name] = stat

// If it's not a directory, just return.
if !stat.IsDir() {
	return fileList, nil
}

// It's a directory.
fInfoList, err := ioutil.ReadDir(name)
if err != nil {
	return nil, err
}
// Add all of the files in the directory to the file list as long
// as they aren't on the ignored list or are hidden files if ignoreHidden
// is set to true.

outer:
for _, fInfo := range fInfoList {
path := filepath.Join(name, fInfo.Name())
_, ignored := w.ignored[path]

	isHidden, err := isHiddenFile(path)
	if err != nil {
		return nil, err
	}

	if ignored || (w.ignoreHidden && isHidden) {
		continue
	}

	for _, f := range w.ffh {
		err := f(fInfo, path)
		if err == ErrSkip {
			continue outer
		}
		if err != nil {
			return nil, err
		}
	}

	// asaf: handle symlink files
	for fInfo.Mode()&os.ModeSymlink != 0 {
		link, err1 := os.Readlink(path)
		if err1 != nil {
			continue outer
		}
		fInfo, err1 = os.Stat(link)
		if err1 != nil {
			continue outer
		}
	}
            // asaf: end update

	fileList[path] = fInfo
}
return fileList, nil

}