Add script for easily testing on Python 3.

Author: takluyver

run_tests_py3.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+python3 setup.py build
+
+if [ -d build/py3_testing ]; then
+    rm -r build/py3_testing
+    echo "Removed py3_testing directory from previous run."
+fi
+
+mkdir build/py3_testing
+cp -r test build/py3_testing/
+cp run_tests.py build/py3_testing/
+cp -r build/lib/rdflib build/py3_testing/
+
+cd build/py3_testing
+
+2to3 -wn --no-diffs test
+2to3 -wn --no-diffs run_tests.py
+
+python3 run_tests.py