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Romain FrancoisWes McKinney
9da45843716
Romain Francois authored and Wes McKinney committed 9c8ddae1162
ARROW-3942: [R] Feather api fixes

Some fixes  to follow up open #3043, and added the columns argument to `read_feather` that can be:

 - character vector
 - integer vector : 1-based in R
 - NULL: to get all columns (the default)

Also adds `as_tibble` argument to read_feather to switch between data.frame and arrow::Table return value

Author: Romain Francois <romain@purrple.cat>

Closes #3106 from romainfrancois/ARROW-3942/feather and squashes the following commits:

13061af4d <Romain Francois> fixed link in documentation
ce414c153 <Romain Francois> + as_tibble argument to read_feather()
d6c30a38b <Romain Francois> + columns argument to read_feather()
46a6fbb69 <Romain Francois> Update feather factories