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

pkg/core/node_info.go

@@ -1,8 +1,36 @@
 package core
 
+import (
+	"fmt"
+)
+
+type NodeType int
+
+const (
+	GETH NodeType = iota
+	PARITY
+	INFURA
+)
+
 type Node struct {
 	GenesisBlock string
 	NetworkID    float64
 	ID           string
 	ClientName   string
 }
+
+type ParityNodeInfo struct {
+	Track         string
+	ParityVersion `json:"version"`
+	Hash          string
+}
+
+func (pn ParityNodeInfo) String() string {
+	return fmt.Sprintf("Parity/v%d.%d.%d/", pn.Major, pn.Minor, pn.Patch)
+}
+
+type ParityVersion struct {
+	Major int
+	Minor int
+	Patch int
+}