better IndexDefinition#initialize on PostgreSQL AR <= 3.1
deprecate (unused) insert_bind + note on IndexDefinition args
gimme a copyright
(yet again) enable running Rails's AR tests (for now works with 3-2-stable)
track test output from AR's suite - so we can track later against regressions

run against 3-2-stable at fe588537654adc583d54157b1a5db48786452adf
backport type_cast_config_to_xxx adapter helpers from AR-4.0
support config[:insert_returning] + do not warn missing seq for id column
[postgres] improve #insert_sql (uses primary_key, supports all AR versions)
this test weirdly fails on 3.1.12 but only until when run with others ... wtf?!
re-arrange postgres tests - mainly trying to track out artificial failure on 3.1
but gave up for now - renamed failing test to execute before the ones affecting it ... it's worth nothing that the failure only happened on AR-3.1