atwam/money-historical-bank — pull request #3 by rafaelp (2012-08-10 21:38:46+00:00)
Title: Fix of import and export

You were using Date.today as hash key to store rates for a specific date.
The problem is that after exporting to a string and importing again the key never returns as a Date object.
So I changed the code to use string as hash key.
```ruby
@rates[date.to_s]
```
I've written an test to it.