Update .gitignore to ignore sqlite temp db files.
Update .gitignore to ignore sqlite temp db files.

churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone,churchlab/millstone,woodymit/millstone,woodymit/millstone_accidental_source,woodymit/millstone_accidental_source,woodymit/millstone_accidental_source,woodymit/millstone,churchlab/millstone,churchlab/millstone,woodymit/millstone