update ReadMe.md
fix Issue about drag in multi trees & expandNode

Issue Info:
1.  when you drag node in multi trees, the other tree will trigger the
addHoverDom callback.
2.  when you drag node in multi trees, if 'beforeDrog' return false or
'setting.edit.drag.prev / inner / next' return false,  the source node
will not trigger addHoverDom callback
3.  When you set async.enable = true, and you use expandNode() function
to expand node,  if you set sonSign = true, you will can't see it's
child nodes.
update index.html
update index.html
update index.html
update index.html
update index.html
release v3.5.13
rename
fix issue about : drag-drop node will throw error, if the page has iframe.
fix issue about : after remove all the child nodes, you use addNodes() method to add node to the parent node, you will can't see the node's DOM
update jQuery plugins
release v3.5.14
fix some small issue (e.g: isCancel parameter in beforeRename & onRename;  Demo: async_edit.html)
no message
modify the wrong word about demo.
fix issue about : If some node's <a> tag has custom dom and this dom hasn't id, so drag the other node to this node's custom dom will can't drag to this node.
Merge pull request #1 from zTree/master

Merge最新版本