Fix typo and model value (#202)

Author: dvdmarchetti

docs/en/api.md

@@ -200,7 +200,7 @@
         var resource = this.$resource('/user/:id')
         resource.save({ id: this.id }, {
           username: this.username,
-          passowrd: this.new
+          password: this.password.new
         }, function (data, stat, req) {
           // something handle success ...
           // ...