Full paths instead of relative paths about storr HOT 2 CLOSED

Thanks - as noted on your PR I agree with you entirely

from storr.

library(storr)
x = storr_rds("storr")
x$driver$path
## [1] "storr"
x$set("a", 1)
x$list()
## [1] "a"
dir.create("subdir")
setwd("subdir")
x$list()
## character(0) # Should be "a"

Implementation could get a tad tricky: what if the user supplies the full path to storr_rds() in the first place?

A fix here would fix ropensci/drake#13. Related: r-lib/memoise#51.

from storr.