Bug 17091: Add AUTOLOAD to Koha::Objects

Bug 17091: Add AUTOLOAD to Koha::Objects

Up to now if a Koha::Objects based object needs to call DBIx::Class methods, we
have to create a new method for Koha::Objects, something like:
  sub method {
    my $self = shift;
    return $self->_resultset->method
  }

To simplify and ease the call to DBIx::Class method, this patch defines an
AUTOLOAD to call the DBIx::Class method on the resultset we are encapsulating.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>