Impute below all

[njtierney]

Description

This PR changes impute_below to impute_below_all - since it operates on all columns. It also makes impute_below an alias to shadow_shift. More discussion on shadow_shift's deprecation at #193

Related Issue

This fixes #159

Example

library(naniar)

impute_below(c(1,22,3,NA,0.1))
#> [1]  1.000000 22.000000  3.000000 -2.516131  0.100000
impute_below_all(airquality) %>% head()
#>       Ozone   Solar.R Wind Temp Month Day
#> 1  41.00000 190.00000  7.4   67     5   1
#> 2  36.00000 118.00000  8.0   72     5   2
#> 3  12.00000 149.00000 12.6   74     5   3
#> 4  18.00000 313.00000 11.5   62     5   4
#> 5 -19.72321 -33.57778 14.3   56     5   5
#> 6  28.00000 -33.07810 14.9   66     5   6

Created on 2018-08-12 by the reprex package (v0.2.0).

Tests

Yes, tests have been included!

NEWS + DESCRIPTION

Yup!