1. [./Persist/Source/Source.pm] An exception should occur in table when the
   given table doesn't exist.
2. [./Persist/Driver/Memory/Memory.pm] Perform rudimentary checking on
   insert to make certain that the user doesn't attempt to insert
   non-scalars.
3. [./Persist/Driver/Memory/Memory.pm] Perform rudimentary checking on
   update to make certain that the user doesn't attempt to update
   non-scalars.
4. [./Persist/Driver/DBI/DBI.pm] Throughout this code all tables and field
   names should be double quoted to make sure names are compatible
   everywhere.
