updated readme/changes
fixed version numbers in readme
Merge remote-tracking branch 'rr-github/master' into github-master-to-commit
array fast paths now check for null
Three small bugs:
  - ArrayStateFactory now forgets the right state when two are created
lazily.
  - FineArrayState now checks to ensure the expected value is there
before writing.
  - FastTrackTool had a readEpoch in place of a writeEpoch in the
fastpath for writes.
FastTrackTools now are more careful in join to not increment a gc'd
thread.
Merge branch 'github-master-to-commit'