Functions for custom mapping only work for non-tbl data

[angela-li]

Custom boxbreaks functions and such in Basic Mapping - Extreme Value Maps were written for st_read( )-output spatial data and doesn't play well with read_sf( )-output spatial data (aka tibbles)

Need to revise functions to work with tibbles and/or get them into tmap as PRs.

[angela-li]

Workaround for now so that book still builds, is to remove tbl class from nyc_sf from geodaData (0b42a19): not a permanent solution, need to fix functions.

[angela-li]

I think the problem is that the first 3 tutorials use read_sf and the 4th one uses st_read, which leads to inconsistency in terms of data reading. Need to settle on one way to read in spatial data!

[angela-li]

Chatted with Grant, I think we'll try to stick with st_read( ) for rest of functions - can always convert others to tbls later. Will affect geodaData datasets (make sf objects, but not tibbles, except for nyc data? or just do as_tibble())