Add `id:` when logging state transitions

[rranelli]

When logging state transitions we should tell the number we are logging is an object id:

We should change:

msg = "Finished #{id(object)}transition to #{object.status} " \
"with #{method}#{format_args(args)}" #=> Finished [42] transition to final_state with event

To something like:

msg = "Finished #{id: id(object)}transition to #{object.status} " \
"with #{method}#{format_args(args)}"  #=> Finished [id:42] transition to final_state with event