fix remaining Errors & Failures caused by running model tests
(except lack of XML parser)
Restore expected connection.select_all(sql) functionality

In Rails 4, connection.select_all returns ActiveRecord::Result instance instead of an Array,
so convert it to array
Fix final issue for model tests
delete useless test (test_has_xml_parser)
Fix Passing options to #find is deprecated
(Fixed at least some instances of this warning.)

See https://groups.google.com/forum/#!topic/mo-developers/ksuMoiTgm5c