0.7.0

This is a big milestone in completeness and stability. The sequence-of-operations property test had been on my list of things for a long time, finally writing it did two things:

• Revealed some operations on SubunitFraction and Overdraft that were glaringly missing.
• Helped identify a bug in Money.__rtruediv__ that would have otherwise passed its unit tests (it failed raising an exception for division by zero and instead returned zero).

So quite a big yield for a moderately sized investment.

What's Changed

• Implement missing subunit fraction operations by @antonagestam in #76
• Implement missing overdraft operations by @antonagestam in #77
• feature: Add sequence-of-operations property test by @antonagestam in #78

Full Changelog: 0.6.0...0.7.0