Retrieving the on-hold balance value.

[wolfovik]

Added display for the on-hold balance. A new 'on_hold' parameter has been added. Fully backward compatible. See details in README.

[wolfovik]

I just noticed that the parse_price construct is no longer needed. The bal_dict dictionary already contains all the necessary information. In my test account, it's a
<class 'dict'>: {'wallet_currency': 5, 'wallet_country': 'RU', 'wallet_state': '', 'wallet_fee': '1', 'wallet_fee_minimum': '1', 'wallet_fee_percent': '0.05', 'wallet_publisher_fee_percent_default': '0.10', 'wallet_fee_base': '0', 'wallet_balance': '232563', 'wallet_delayed_balance': '0', 'wallet_max_balance': '12500000', 'wallet_trade_max_balance': '11250000', 'success': 1, 'rwgrsn': -2}.

[bukson]

Merged manually, please next time just make 1 commit and rebase it onto current master, thanks!