[e-lang] ref_send API v1.0

[Tyler Close]

I've updated the ref_send API to reflect the Joe-E v1.0 API and stamped it 1.0.

The 1.0 release means backwards compatibility will be maintained and
so the API provides a stable base upon which to build capability-based
Java applications.

I also added another small example to the release, a tail recursive
factorial implementation. This example shows how ref_send supports the
functional programming paradigm. The main body of the implementation
is:

    static public Promise<Integer>
    factorial(final Eventual _, final int n) {
        if (n < 0) { return new Rejected<Integer>(new Exception()); }
        final Recursion loop_ = _._(new Recursion() {
            public Promise<Integer>
            run(final Recursion loop_, final int n, final int acc) {
                if (n == 0) { return ref(acc); }
                return loop_.run(loop_, n - 1, n * acc);
            }
        });
        return loop_.run(loop_, n, 1);
    }

This code is busier than a Scheme programmer would like, but I think
the algorithm is still clear, and more importantly, it's written in
Java, making the technique available to Java programmers.

The ref_send 1.0 download is at:

http://waterken.sourceforge.net/download.html

and the Javadoc is at:

http://waterken.sourceforge.net/javadoc/

Tyler

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