http://steamproxy.com/sharedfiles/filedetails/?id=687959725

Steam Market Page
A game that is currently undergoing the steam greenlight process has announced they will be adding a steam inventory in the near future :D

Originally posted by Devs:

Features planned after being Greenlit:
• Steam Inventory.
• Steam Achievments.
• Steam Workshop - Upload content in the same way as other famous games work with workshop: CS:GO, TF2