blz: into DataFrame <- btable
blz: chunks
blz: chunks of blz yields DataFrames

This should be faster (columnar)
blz: turns out turning chunks into numpy arrays is still faster
blz: chunked reductions
blz: more chunked reductions, also added test file
Merge branch 'master' into bcolz
numpy: union
union: subterms
blz: use union in distinct
Merge branch 'bcolz' of github.com:mrocklin/blaze into bcolz-chunks
blz: use chunked compute
copy blz code to bcolz