v1.6.0

• Calling openNode will now return true while loading on-demand child nodes (14cdbcb)
• Changes to removeChildNodes and removeNode:
  • No nodes will be selected if the next selected node is the root node (ea75a58)
  • The original reference to the root node will not be destroyed if all child nodes are removed (e7a7004)
• Adds more tests
• Adds npm package dependencies
  • classnames
  • element-class
  • escape-html
  • html5-tag
  • is-dom