Minor fix for #15

Author: unknwon

repo_branches.go renamed to repo_branch.go

@@ -1,12 +1,17 @@
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package gogs
 
 import (
 	"fmt"
 )
 
+// Branch represents a repository branch.
 type Branch struct {
-	Name      string         `json:"name"`
-	Commit    *PayloadCommit `json:"commit"`
+	Name   string         `json:"name"`
+	Commit *PayloadCommit `json:"commit"`
 }
 
 func (c *Client) ListRepoBranches(user, repo string) ([]*Branch, error) {