Revert "ingoring build/"

This reverts commit 294ddeab16267dbda8546ee54fb21130db5cdecd.

ignoring .gitignore
Revert "format output of tables"

This reverts commit 572d302d620f36315683c469a88de9c20741b4fc.

Conflicts:
	dataset/persistence/database.py
return db.tables an iterable