Generate logger once
Move storage(app) helper to Mamiya::Master
Add Master#distribute
Implement POST /packages/:app/:pkg/distribute API
Let serf config overriddable by command line

- Config#[]= to set configuration
$MAMIYA_SYNC_OUT to enable $stdout.sync

For foreman
Annotate why we're doing this here
Stop passing event object by method argument

it has passed to handler class constructor
Ignore AlreadyFetched error