Add BlockchainDBObserver

* First code that interacts

main.go

@@ -2,7 +2,11 @@ package main
 
 import (
 	"flag"
+
+	"log"
+
 	"github.com/8thlight/vulcanizedb/core"
+	"github.com/jmoiron/sqlx"
 )
 
 func main() {
@@ -11,5 +15,11 @@ func main() {
 
 	var blockchain core.Blockchain = core.NewGethBlockchain(*ipcPath)
 	blockchain.RegisterObserver(core.BlockchainLoggingObserver{})
+	pgConfig := "host=localhost port=5432 dbname=vulcanize sslmode=disable"
+	db, err := sqlx.Connect("postgres", pgConfig)
+	if err != nil {
+		log.Fatalf("Error connecting to DB: %v\n", err)
+	}
+	blockchain.RegisterObserver(core.BlockchainDBObserver{Db: db})
 	blockchain.SubscribeToEvents()
 }