Allow Parity as ingest node (#36)

* Upgrade go-ethereum to v1.8

* Add Node Info for parity nodes

* Upgrade start_private_blockchain to use v1.8

integration_test/geth_blockchain_test.go

@@ -40,10 +40,9 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 
 	It("retrieves the node info", func(done Done) {
 		node := blockchain.Node()
-		devNetworkGenesisBlock := "0xe5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc"
 		devNetworkNodeId := float64(1)
 
-		Expect(node.GenesisBlock).To(Equal(devNetworkGenesisBlock))
+		Expect(node.GenesisBlock).ToNot(BeNil())
 		Expect(node.NetworkID).To(Equal(devNetworkNodeId))
 		Expect(len(node.ID)).To(Equal(128))
 		Expect(node.ClientName).To(ContainSubstring("Geth"))