MiniTest condition removed

remove more conditions for Fiber in ruby19

fiber is available in ruby19 condition removed

ruby 1.8 ActiveSupport BasicObject no longer available

remove condition since to_time always available in ruby19 DateTime

Fix #2572 and define fixture table name in the associated model

AS::Callbacks: remove __define_runner

refactor Range#include? to handle ranges with floats

Renamed "fixture_name" to "accessor_name" and made fixture names in the form "admin/users" be used as the key for the hashes @fixture_cache and @loaded_fixtures.

Previously the variable "fixture_name" here was getting a value of the form "admin_user", and this value was then used as the hash key.

Made the fixture's table name be taken from its model class whenever this class responds to table_name, instead of inferring it sometimes from the fixture's pass.

The previous behavior seemed buggy because it depended on whether the model class was passed as a constant or as a name string.

Improved Fixtures#initialize.