0.4.4 - Error reporting and more

I've released a pair of point releases right together.

The first, 0.4.3, added support for the DomainMetadata API endpoint and allowed control over whether the class uses SSL (and whether it uses VERIFYHOST and VERIFYPEER if it does use SSL).

The second, 0.4.4, adds full human-readable error reporting. I also rearranged a few development targets, planning out 0.4.5 and 0.4.6 a bit better.

I've also decided (in a future revision) to drop the range check on the number of attributes passed to putAttributes. Amazon's servers do the checking; they'll report an error if the user sends too many, and I don't want to have to change the code if Amazon changes the limit later.