Add tea open (#101)

Fix open default to home page

Improve path join and open with no arg

add labels and milestones

Add tea open

Reviewed-on: https://gitea.com/gitea/tea/pulls/101
Reviewed-by: 6543 <6543@noreply.gitea.io>
Reviewed-by: John Olheiser <john.olheiser@gmail.com>

modules/git/url.go

@@ -1,3 +1,7 @@
+// Copyright 2019 The Gitea 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 git
 
 import (