Think about name of package function

[chriskohlhoff]

[ja11sop]

General concern about avoiding "land-grabs" impacting name choices on the off-chance that a name be made available to a less suitable future library/name. However in fairness both wrap and package are sufficiently general to warrant examination.

[chriskohlhoff]

Pre-Lenexa Summary

[async.package]

The package function is a factory for packaged_handler objects (via packaged_token).

May be related to #191. Perhaps qualifying the name is best, unless there is a compelling alternative.