update docs, refactor out ColumnDefinition (for pg)... bump minor

bump minor

fix upserting by auto-increment primary key on postgresql

properly quote table names - don't assume ANSI_QUOTES is enabled in M…

…ySQL :)

compatibility with PGconn aka PG::Connection

bump patch

bump minor

fix test for 1.8.7

bump patch

set up Pet.upsert, the ActiveRecord helper