merk/merkDoughBundle — pull request #2 by yethee (2012-05-14 19:31:12+00:00)
Title: Add ability to configure the Bank

Added the configuration for the Bank and array exchanger. It provides support the `MultiCurrencyMoney`.

By defaults, if config is missing, will be using the basic Bank.

For using multiple currencies you can configure the default currency and an array of currencies for the bank. In this case will be using the `MultiCurrencyBank`.
By default the `MultiCurrencyBank` uses the array exchanger. You can specify id of the service of the custom exchanger.

```yaml
merk_dough:
bank:
default_currency: EUR
currencies: [EUR, USD, DEM]
exchanger: acme.my_exchanger
```

Example of configure the default exchanger service:

```yaml
merk_dough:
exchanger:
currencies:
USD:
rates:
EUR: 0.774
RUR: 30.179
EUR:
rates:
USD: 1.292
RUR: 38.983
```