rvertnet v0.4.0

NEW FEATURES

• New set of functions to make working with VertNet data dumps
  easier. dump_links() gives you links to various data dump
  resources; dump_init() initialized a SQLite database connection;
  dump_tbl() creates a dplyr::tbl object, which can then be used
  in a dplyr query. This setup requires that the user manually
  download data dumps uncompress, and load into SQLite. We hope to
  make this process easier in the future. (#36)

MINOR IMPROVEMENTS

• Fixes to vertmap() for new ggplot2 version (#43)
• Added note to docs for bigsearch() for how to read in data
  after obtaining the data (#44)

BUG FIXES

• Fix to the searchbyterm() function. When the parameter stateprovince
  was used, lead to error, as that param requires different handling than
  other params. (#45)