Move sketch to top-level package directory.

The sketch is also renamed from 'wonder_processor' to 'wonder'.
There are corresponding updates in the deployed zsh environment dotfile
to reflect the new path to the sketch directory.
Make lib:release task build date-stamped zips.
Adjust default rake task dependencies.

A direct 'rake' invocation will now build (rather than release) the
library, export the sketch, and check the syntax of the web app sources.
Simplify Processing rake tasks.
Fix rake run task.

Also fixes the sketch name in the web server.