rtimes v0.4.0

NEW FEATURES

• as_search gains new parameter all_results to internally
  paginate to get all results. In addition, user can optionally
  have the function attempt to flatten completely the output
  data.frame, but sometimes may fail so isn't turned on by
  default (#15)

MINOR IMPROVEMENTS

• Now API keys have to be stored as environment variables instead
  of options (#12)
• Campaign and Congress APIs moved to Propublica. Updated base URLs, etc
  for the move, but many routes still not covered. (#13)
• Replace dplyr::rbind_all with dplyr::bind_rows (#14)