Add ability to populate missing blocks

* The command populates up to the highest known block number
 * The anticipated use case is that the listener will be running
   in parallel to the populateBlocks command
    * This will mean that the listener is responsible for picking up
      new blocks, and the populateBlocks command is reposible for
      historical blocks
 * Reformat SQL statements

cmd/populate_blocks/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"flag"
+
+	"log"
+
+	"fmt"
+
+	"github.com/8thlight/vulcanizedb/pkg/config"
+	"github.com/8thlight/vulcanizedb/pkg/geth"
+	"github.com/8thlight/vulcanizedb/pkg/history"
+	"github.com/8thlight/vulcanizedb/pkg/repositories"
+	"github.com/jmoiron/sqlx"
+)
+
+func main() {
+	environment := flag.String("environment", "", "Environment name")
+	startingBlockNumber := flag.Int("starting-number", -1, "First block to fill from")
+	flag.Parse()
+	cfg := config.NewConfig(*environment)
+
+	blockchain := geth.NewGethBlockchain(cfg.Client.IPCPath)
+	connectString := config.DbConnectionString(cfg.Database)
+	db, err := sqlx.Connect("postgres", connectString)
+	if err != nil {
+		log.Fatalf("Error connecting to DB: %v\n", err)
+	}
+	repository := repositories.NewPostgres(db)
+	numberOfBlocksCreated := history.PopulateBlocks(blockchain, repository, int64(*startingBlockNumber))
+	fmt.Printf("Populated %d blocks", numberOfBlocksCreated)
+}