Track roxygen-generated NAMESPACE and documentation in git

[brookslogan]

Installing the package via

devtools::install_github("cmu-delphi/delphi-epidata-r", ref="fix-rbuildignore-makefile-typo")

produces multiple instances of these warnings:

Warning messages:
1: replacing previous import ‘jsonlite::unbox’ by ‘rlang::unbox’ when loading ‘delphi.epidata’ 
2: replacing previous import ‘jsonlite::flatten’ by ‘rlang::flatten’ when loading ‘delphi.epidata’ 

and attempts to read the documentation, e.g.,

help(epirange)

come back with

No documentation for ‘epirange’ in specified packages and libraries:

while cloning and running devtools::document() then devtools::unload() then devtools::install() appears to resolve the above problems.

While it's not the git way to track auto-generated files, it seems to be the R way. Tracking the NAMESPACE and .Rd files should simplify and improve the installation experience.