document the change in edge rails which makes a more strict check on the arity of the dynamic finders

Fixes typo

Fix typo

See https://github.com/lifo/docrails/commit/5c71a4e76897844ab6aeabb581549d981d9768c9#commitcomment-485675

Children attributes can be either String's or Symbol's, so let's check if the object responds to to_i.

Revert "this fixes a brittle test in fixtures_test.rb which fails when you are in a timezone which is ahead of UTC but UTC is in the previous day still."

This reverts commit f92cefa9.

Fixed issue #2119: XHR without Accept and Content-Type header gets 500 error

Timezone fixtures test correction

notextile tag in rails guides generator has been placed with ascii quotes