Merge pull request #108 from enthought/bugfix/update-readme

Update README.

Author: markkness

README.rst

@@ -4,10 +4,22 @@
 Distributed Array Protocol
 ==========================
 
-Source repository for the Distributed Array Protocol document.
+Source repository for the Distributed Array Protocol document and associated
+utilities.
 
-The document itself is `protocol.rst`, located in this directory.
+A validator for data structures defined in the protocol is included as
+``validator.py``.
 
-For a version of this document rendered as HTML, see
+For a version of the protocol document rendered as HTML, see
 
 http://distributed-array-protocol.readthedocs.org
+
+To build a version of the protocol document yourself, install `Sphinx`_, then
+run ``make html`` or ``make singlehtml`` in this directory.  See the output of
+``make help`` for more information.
+
+.. _Sphinx: http://sphinx-doc.org/
+
+To run the tests for the validator and included utilities, run ``python -m
+unittest discover`` from this directory.
+