check respond_to? before doing an instance_eval
require (faked) 'mysql' when running Rails unit tests
dup JNDI_CONFIG so the modifications to the config do not cause failures
do not load the AR built-in adapters eagerly - but on demand (closes #353)
avoid rake trace output 'failure' on JRuby 1.6.8
some AR 4.0 (master) compatibility in tests
[sqlite3] fix remove_column on AR-4.0
update to latest AR 4.0 (Rails master)
Import quote_table_name_for_assignment for postgresql from AR4