support refresh
only auto refresh root
Add new listeners
init listeners in a func
detected 'git' command before add listeners
auto refresh
auto refresh
Merge branch 'develop' of https://github.com/Xuyuanp/nerdtree-git-plugin into develop

* 'develop' of https://github.com/Xuyuanp/nerdtree-git-plugin:
  auto refresh

Conflicts:
	nerdtree_plugin/git_status.vim
set git status cache time expiry
adapt new notifier interface
add syntax highlight
Merge branch 'feature/add_syntax_highlight' into develop
remove simple indicator
Merge branch 'feature/remove_simple_indicator' into develop
refresh dir node only after buffer write
Merge branch 'develop'