need to match AR 4.0 built-in patterns to re-define (oracle) tasks correctly
advocate --ignore-dependencies to gem install since it might pull in latest AR
[mysql] allow encoding to be server-detected (using `encoding: false`)
due compatibility we still default to `encoding: utf8` if not set (fixes #481)
can not miss 11/12/13 for a release 1.3.3 :bangbang