fix crash when typedbytes not installed as egg

simplify/cleanup listing code in cat function

preserve order of option values (fixes #57)

adapt Job's run method to fix error reporting (fixes #56)

Release 0.21.32

Merge branch 'master' of github.com:klbostee/dumbo

make tests run on ubuntu with zope.interface installed (fixes GH-37)

Release 0.21.29

Release 0.21.28

Release 0.21.27