Add graphql server (#27)

* Add graphql server

* Update Makefile

* Update log_filters constraint

* Add GetLogFilter to repo

* Update travis (use Makefile, go fmt, go vet)

* Add logFilter schema and resolvers

* Add GetWatchedEvent to watched_events_repo

* Add watchedEventLog schema and resolvers

cmd/root.go

@@ -4,15 +4,17 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/vulcanize/vulcanizedb/pkg/config"
 	"github.com/mitchellh/go-homedir"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
+	"github.com/vulcanize/vulcanizedb/pkg/config"
 )
 
-var cfgFile string
-var databaseConfig config.Database
-var ipc string
+var (
+	cfgFile        string
+	databaseConfig config.Database
+	ipc            string
+)
 
 var rootCmd = &cobra.Command{
 	Use:              "vulcanizedb",