Moved wat-tree-node out of wat-tree
Changed tree node from li to div

So that when hovering an item it will highlight only the current item but not the children
Allow add/delete animations
Allow add/change name of animations
Merged tree view and timeline
Allow zooming on the timeline
Changed normal button to wat button
Merge pull request #98 from Jackyjjc/timetree_rebase

Added more features to the tree view and put the tree view and timeline together