Add 'data_frame' function (#376)
Make use of lazy (#376)
Merge branch 'feature/data-frame' of github.com:kevinushey/dplyr into kevinushey-feature/data-frame
useDynLibs & don't need internals
Only one #
Name all columns. Recycle length 1 vectors.
Improve documentation
Merge branch 'kevinushey-feature/data-frame'