[timeout] handlers & mutators can have a timeout, reworked async popen
[timeout] additional async_popen() test, popen() returns the output/status array
[timeout] no need to specify class, self
[timeout] updated changelog
[timeout] added more context to handler output log lines
Merge pull request #620 from portertech/timeout

[timeout] handlers & mutators can have a timeout, reworked async popen