migration methods are now getting migration as first argument

spec/assets/migrations/20111117063700-createPerson.js

 module.exports = {
-  up: function(Interface, DataTypes) {
-    Interface.createTable('Person', {
+  up: function(migration, DataTypes) {
+    migration.createTable('Person', {
       name: DataTypes.STRING
     })
   },
-  down: function(Interface) {
-    Interface.dropTable('Person')
+  down: function(migration) {
+    migration.dropTable('Person')
   }
 }

spec/assets/migrations/20111123060700-addBirthdateToPerson.js

 module.exports = {
-  up: function(interface, DataTypes) {
+  up: function(migration, DataTypes) {
 
   },
-  down: function(interface, DataTypes) {
+  down: function(migration, DataTypes) {
 
   }
 }