Import tibble

[aaronwolen]

Substantive changes:

• tibble is now imported so data tables are printed nicely even if tibble or dplyr are not yet loaded

Vanity changes:

• added an author (if that's cool with you)

[stephenturner]

much appreciated! I started doing this with some of my other data packages too, nice to have this done for me here! 🙇