Merge pull request #353 from shxsun/master

initial utils dir

utils/file.go

+package utils
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func SelfPath() string {
+	path, _ := filepath.Abs(os.Args[0])
+	return path
+}

utils/file_test.go

+package utils
+
+import (
+	"testing"
+)
+
+func TestSelfPath(t *testing.T) {
+	path := SelfPath()
+	if path == "" {
+		t.Error("path cannot be empty")
+	}
+	t.Logf("SelfPath: %s", path)
+}