Initial branch commit; conversion of methods to use org.json.*.
Update README.md

Branch version of the readme.
Removed some walk-through code.
Removed some walk-through code.
General-purpose refactoring.
Status events are arrays and not objects.  Oops.
Fixed error on exception thrown when adding items.
Changed getString("text") to optString("text").
Removed code step-through.
Created mapping for descriptions.
Merge branch 'json-reference' of https://github.com/nosoop/SteamTrade-Java.git into json-reference
Moved inventory parsing to one method.
Made TradeInternalCurrency a subclass of TradeInternalItem.
Added and exposed currency amount.
Currency support and cleanup general.
Converted a few more JSONObject get() methods to be more specific.
Removed JSON Simple.
Update README.md
Merge pull request #1 from nosoop/json-reference

Converted to use reference JSON library.