e-Gold: Manage an e-Gold account

This class can be used to manage an e-Gold account.

It can access the e-Gold site on behalf of an authenticated user. It can perform several types of operations:

- Retrieve the history of transactions
- Retrieve the account balance of different metals
- Retrieve the exchange rates of the metals
- Verify whether a given transaction would be allowed
- Perform a payment transaction
- Retrieve the payments that were made
Class to manage e-Gold Account
This class can be used to:
- show account balance
- show account history
- show exchange rates of metals
- do a transactions
- verify payments