Avoid sending post messages to the current window as it interferes with testing post messages (duh).
Merge pull request #12 from tobie/fixpostmsg

Avoid sending post messages to the current window as it interferes with ...
Make step() return the argument's return value
Merge pull request #14 from zcorpan/master

Make step() return the argument's return value
Prevent infinite recursion formatting cyclicly nested arrays
fixup! Prevent infinite recursion formatting cyclicly nested arrays
Merge pull request #19 from jgraham/format_value_recursion

Prevent infinite recursion formatting cyclicly nested arrays
fix processing of constants
Merge branch 'master' of github.com:w3c/testharness.js
better error messages for implements
Improve the assertion failure when testing for an unimplemented attribute
Merge pull request #22 from w3c/unimplemented-error-message

Improve the assertion failure when testing for an unimplemented attribute