Merge branch 'master' of github.com:500tech/angular-tree-component

Added copy node on drag while ctrl is pressed

Updated changelog, example, package.json

Added setHiddenNodeIds

Added state binding and methods
Removed isHiddenField

Merge branch 'master' of github.com:500tech/angular-tree-component

# Conflicts:
#	lib/defs/api.ts

Removed unwanted code

Fixed close / open quickly when animating

Fixed allowDrop

example build

docs and build