Added test_pystache.py for Python 2.4.

test_pystache.py

+#!/usr/bin/env python
+# coding: utf-8
+
+"""
+Runs project tests.
+
+This script is a substitute for running--
+
+    python -m pystache.commands.test
+
+It is useful in Python 2.4 because the -m flag does not accept subpackages
+in Python 2.4:
+
+  http://docs.python.org/using/cmdline.html#cmdoption-m
+
+"""
+
+from pystache.commands.test import main
+
+if __name__=='__main__':
+    main()