Fixed sequence id match for postgresql

PgAdmin generates   sequence as  '"Schema"."Table_seq"'::regclass  when
non public schema is used.
Merge pull request #1603 from edin/master

Fixed sequence id match for postgresql
Merge remote-tracking branch 'upstream/master'
Draft implementation of ActiveQuery::joinWith().
Merge remote-tracking branch 'upstream/master'
Postgres Schema indexes information