Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Change Event#thread_id to #transaction_id. Defaults to one "transaction" per thread but you can explicitly declare the start of a new one. This makes it possible for each request to have it own id.

AS::Notifications.subscribe blocks are now yielded the arguments to pass to AS::Notifications::Event.new

Signed-off-by: NYehuda Katz <wycats@gmail.com>