tompesman/push-core — pull request #22 by tilo (2014-03-19 01:11:53+00:00)
Title: Feature/tracking external message ids

user can now provide an ext_id when creating a Push::Message or sub-class thereof,
which then tracks an external message id which will get logged on success/failure,
and will also be persisted in the push_messages table so messages can be correlated later
for debugging.