move helper script to scripts dir and add one to Makefile

Makefile

@@ -19,3 +19,7 @@ publish:
 	python setup.py sdist bdist_wheel upload
 	git tag `python setup.py --version`
 	git push origin `python setup.py --version`
+
+scaffold:
+	@pip install -r requirements-dev.txt > /dev/null
+	@python scripts/scaffold.py

scripts/scaffold.py

@@ -24,7 +24,7 @@ from implementation_coverage import (
 )
 from inflection import singularize
 
-TEMPLATE_DIR = './template'
+TEMPLATE_DIR = os.path.join(os.path.dirname(__file__), './template')
 
 INPUT_IGNORED_IN_BACKEND = ['Marker', 'PageSize']
 OUTPUT_IGNORED_IN_BACKEND = ['NextMarker']