Seqs as tuple souces; chaining of `sink-as` to source-shaping.
Adapt task var functions via user-provided adapter functions.
Make `collfn` the default task adapter function.
Update NEWS with changes for 0.5.0.
Add README "Contributing" section.
Release version 0.5.0.
Begin work on next iteration.
Fix some typos.
Slightly simplify README example.
Add in-depth documentation for actual MapReduce interfaces.
Tweak formatting.
Reduce some documentation noise.
Prune unnecessary unwrapping from matrixify example.
Missed newline in example-tweaking.
Fix broken Avro shuffle cstep.
Check if job is running vs assuming running & check complete.
Run local jobs in serial to work around MAPREDUCE-5367.
Fix incorrect reference to `partition` in doco.
Log as reducer vs combiner.
Document and consider alternatives to single-pass reduction.