fixed syntax error

lib/migrator.js

@@ -22,9 +22,7 @@ module.exports = (function() {
 
     return new Utils.CustomEventEmitter(function(emitter) {
       self.getUndoneMigrations(function(migrationFiles) {
-        migrationFiles.each(function() {
-          self.executeMigration()
-        })
+        migrationFiles.forEach(function() { self.executeMigration() })
         emitter.emit('success')
       })
     }).run()