- ChangeList: move "Sync" button from BottomBar to commit msg dialog
- support Undo/Redo for Editor
- support stage item on DiffScreen
- update libgit2 to 1.9.0 (fix ssh shallow clone err, issue #10)
- 修改列表页面: 把 "同步按钮"从BottomBar挪到了提交信息弹窗
- 文本编辑器支持撤销和重做
- 支持在比较页面(DiffScreen)暂存条目
- 更新 libgit2 版本 1.9.0 (修复ssh浅克隆错误, issue #10)