example data for http://stackoverflow.com/a/38609662/722162

edges.json

[
	{"from": 1, "to": 2},
	{"from": 1, "to": 3},
	{"from": 2, "to": 4},
	{"from": 2, "to": 5}
]

nodes.json

[
	{"id": 1, "label": "Node 1"}, 
	{"id": 2, "label": "Node 2"},
	{"id": 3, "label": "Node 3"},
	{"id": 4, "label": "Node 4"},
	{"id": 5, "label": "Node 5"}
]