Include the script template files - fixes #220

The rename of the script template files to be .tmpl put them
into the realm of package data, rather than python files that
would be bundled automatically. Include them specifically in
package data so that they'll actually be installed.

setup.py

@@ -100,7 +100,8 @@ with readme_file:
     with changes_file:
         long_description = readme_file.read() + '\n' + changes_file.read()
 
-package_data = {'setuptools': ['site-patch.py']}
+package_data = {
+        'setuptools': ['script (dev).tmpl', 'script.tmpl', 'site-patch.py']}
 force_windows_specific_files = (
     os.environ.get("SETUPTOOLS_INSTALL_WINDOWS_SPECIFIC_FILES")
     not in (None, "", "0")