1. fix: unqualified imports were being looked up oldest-to-newest,
e.g. making shell reloads invisible.
2. began $u revamp, removed now-unused Module method.
1. switch back to asynchronous reactors (they don't execute on the
committing thread). Modify tests to track.
2. fix bug in assert_equals(), was reexecuting expected() and actual()
in failure message.
Merge pull request #88 from bhosmer/master

Misc