Additional SteamApp info through Steam Storefront api

Hello!

I was planning to use your API for a personal project and I realized that some information I needed could not be accessed through the regular Steam Web Api. I looked around and found out about an undocumented api for the Steam Storefront. (More info here: http://wiki.teamfortress.com/wiki/User:RJackson/StorefrontAPI)

I used this API to add properties to the SteamApp class. 

Would you mind taking a look at it? Would you be interested in these changes?

Here's a script that will print all the new info: https://gist.github.com/FrancisLab/aae6ed2cd94228627758.

Any suggestions, comments or questions are welcome.

Thanks and good work on the API.

Francis