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updated description of worlds as a concurrency control mechanism. add…
…ed link to concurrent revisions
completed one of next steps
added worlds_v1: w-refs now implemented as Clojure refs rather than a…
…toms. Allows world-commit to be atomic.
fixed bug in world-commit, added testcase to better cover this function
moved in-world to public API part of the file
updated next steps
initial commit: v0 and rudimentary tests