Mac Nightly Builds

I’ve set up my desktop to churn out nightly Mac builds using the same
process as the 0.9.5 release. (This has the advantage that I can test
the release process for 1.0!) I’ve refined the release process to trim
out more unused code and compress tighter, so the result is 37MB vs.
41MB for the last release.

The latter is a link set automatically to the latest build (e.g., if
you wish to automatically upgrade).

I know Marcus is hoping to set up a nightly Windows build sometime too.