Merge pull request #13 from StevenLooman/master

concepts.Order by StevenLooman
Add missing wallet history functionality

Adds missing history functionality to Private class in mtgox.py. Returns account history information as described here:

https://en.bitcoin.it/wiki/MtGox/API/HTTP/v1#Your_wallet_history
Merge pull request #14 from pbiernat/patch-1

api/mtgox/http_v1: add wallet_history