Update data set to 2014-09-20 

- Updates all data sets to the latest release (2014-09-20).
- Creates an *acceptance* test suite to test numbers against the current data set.
> Why?

Since [it is only useful for development][1] purposes and we only depend on PHPUnit, I though it was safe to ignore it.

[1]: https://getcomposer.org/doc/02-libraries.md#lock-file