Doesnt saved nested medias of user Mongoose model on vk sync finish

[MicrowaveDev]

https://github.com/Jonybang/Awesome-Media/blob/master/app/controllers/vk.js#L292
On this line code for saving numbers of medias objects doesn't work in first time, but work in second time. Because of this, Awesome Medias required synchronization with vk twice.
Some materials of this bug:
http://stackoverflow.com/questions/21243502/saving-nested-objects-in-mongoose
http://stackoverflow.com/questions/21590509/saving-mongoose-nested-schema
http://stackoverflow.com/questions/24054552/mongoose-not-saving-nested-object
Automattic/mongoose#1204