[R] remove feather(path)
[R] remove feather(path)

feather path was beeing called 2 times apparently with no need

Author: Daniel Falbel <dfalbel@gmail.com>

Closes #109 from dfalbel/patch-1 and squashes the following commits:

2fe9067 [Daniel Falbel] remove feather(path)

wesm/feather,wesm/feather,wesm/feather,wesm/feather,wesm/feather,chris-b1/feather,wesm/feather,chris-b1/feather,chris-b1/feather,wesm/feather,chris-b1/feather,wesm/feather,chris-b1/feather,chris-b1/feather