test refactor
make infiniteTable a source
source -> sources
derp, forgot these
add slice source
defer Stop() style derp
more explanation of intended usage of Stop
transform: more accurate field mapping tests
transform: reorg
transform -> transformer
update doc.go for new paths
transformer: add equality table tests
elTransform -> rowTransform
expose general-purpose RowTransform
transformer_test: more general table
transformer: minor improvements
transformer: tableTransform

Also, now rowTransform is a subset of tableTransform. Hooray composition!
transformer: RowTransform same as other transforms
transformer: allow chaining TableTransforms
transformer: tableTransformedTable -> transformedTable