Make Kiva a separate package?

This is really a discussion topic.

While we can keep it in the same repo for convenience, it may make sense for Kiva to be split out from Enable as a stand-alone package (ie. separate entry in PyPI, and separately installable by EDM).

There are downsides to doing this, particularly around distribution.

However Kiva is potentially useful by itself as a drawing framework, and it doesn't require all of the dependencies that Enable has to be useful.