Milestone release

The principle features that are not going to make it into the beta (either in tested code or in documentation), but are too done to be left out of any "release" are:

• Some kinds of 3d PLine support — this is working in principle but has an inconvenient interface.
• More work in BaseGraphicsSystem — including some example code in extras
• More Java-only example code testing the Launcher framework — the noise surrounding OpenFrameworks shows that people are genuinely interested in a raw "application framework" as well as in tools.
• Better support for embedded languages — most of all some real access to globals in the embedded JavaC support.
• Sparkle integration for auto-update.

What will happen between Beta and Release is probably a series of small, incremental beta releases 1 ~ 10 that patch bugs rapidly but are distributed as binaries. Hopefully sparkle integration will be early on in that series.