Allow optional strict N-Quad parsing

This puts more of the logic in cayley, but other approaches require that
db knows about quad formats.

db/init.go

@@ -24,25 +24,10 @@ import (
 
 var ErrNotPersistent = errors.New("database type is not persistent")
 
-func Init(cfg *config.Config, triplePath string) error {
+func Init(cfg *config.Config) error {
 	if !graph.IsPersistent(cfg.DatabaseType) {
 		return fmt.Errorf("ignoring unproductive database initialization request: %v", ErrNotPersistent)
 	}
 
-	err := graph.InitTripleStore(cfg.DatabaseType, cfg.DatabasePath, cfg.DatabaseOptions)
-	if err != nil {
-		return err
-	}
-	if triplePath != "" {
-		ts, err := Open(cfg)
-		if err != nil {
-			return err
-		}
-		err = Load(ts, cfg, triplePath)
-		if err != nil {
-			return err
-		}
-		ts.Close()
-	}
-	return err
+	return graph.InitTripleStore(cfg.DatabaseType, cfg.DatabasePath, cfg.DatabaseOptions)
 }