Real fix for Pull Request #32

* Revert the quick hack as of
  o https://github.com/kmerz/graveio/pull/32
* Use explicit table_name prefix in scoping string to unbreak
  the old test case
Fix typo due to revert and indentation.
Merge pull request #35 from h5b/cleanup

Use explicit table_name prefix in scoping string to address Issue #32