Add Makefile entries for syncing data to S3

cookiecutter.json

@@ -1,4 +1,5 @@
 {
     "project_name": "project_name",
     "repo_name": "{{ cookiecutter.project_name|replace(' ', '_') }}",
+    "s3_bucket": "your-bucket-for-syncing-data"
 }

{{ cookiecutter.repo_name }}/Makefile

@@ -1,7 +1,13 @@
-.PHONY: clean data
+.PHONY: clean data sync_data_to_s3 sync_data_from_s3
 
 data:
 	python src/make_dataset.py
 
 clean:
 	find . -name "*.pyc" -exec rm {} \;
+
+sync_data_to_s3:
+	s3cmd sync --recursive data/ s3://{{ cookiecutter.s3_bucket }}/data/
+
+sync_data_from_s3:
+	s3cmd sync --recursive s3://{{ cookiecutter.s3_bucket }}/data/ data/