[io] no need to provide command in unexpected error rescue
[io] updated changelog
Merge pull request #456 from portertech/io

Cleaned up IO error handling
[amq-client] use amq-client 0.9.11 w/ brianwong's backport
Merge pull request #457 from portertech/amq-client

[amq-client] use amq-client 0.9.11 w/ brianwong's backport
status as string
[io] unexpected popen errors still need to bubble up, but reap 'em zombies
Merge pull request #458 from portertech/io

[io] unexpected popen errors still need to bubble up, but reap 'em zombies
Merge pull request #459 from reliantsecurity/mutator_error_status_as_string

status as string