fork the repo into "dev" and "master"

[njtierney]

in master I just want vis_dat and vis_miss, and in "dev" there will be:

• vis_guess
• vis_dat_ly
• vis_miss_ly
• vis_compare

Also, I think that vis_dat_ly and vis_miss_ly should be their own function, but they will get triggered inside an option, e.g. vis_miss(data, interactive = TRUE)

[njtierney]

Extending from this, I think that the same could be said of vis_guess. Although maybe this is contrary to the tidy tools manifesto.

[njtierney]

Whilst I like this approach, the GitHub version is the dev version, and CRAN is stable, so that is going to be the way I keep things for now.