Failing tests

[chrbala]

Currently 26 tests from abstract-leveldown fail. These tests need to be categorized into issues and fixed before publishing. This is the master issue that tracks these failing tests together.

The failing tests essentially come down to these issues:

• Iterator does not work correctly when the supplied range is not a key
• Iterator does not work correctly when provided both upper and lower bound in reverse
• Confirm correct sorting of keys in iterator

[chrbala]

Fixed all failing tests and published 0.0.2!