testing nfs locking is very difficult.  a unit test will not suffice.

in this directory is contained a script 'test.rb' which attempts to maintain an
ordered list in a NFSStore.  the idea is to run this from a few nodes in the
same nfs mounted directory and to let them compete to maintain the ordered list.
if nfs locking (or other problems such are nfs caching) are problematic one of
two things will happen:

  - script will blow up
  - list will be unordered and script will complain

in summary

  - log into 4 (at least) machines and cd into the same nfs mounted directory
  - run 'ruby test.rb' on each node
  - run 'ruby monitor.rb' on a node (in same directory) to see what's happening
