taxize v0.9.0

Changes to get_*() functions

• Added separate documentation file for all get* functions
  describing attributes and various exception behaviors
• Some get*() functions had NaN as default rows parameter
  value. Those all changed to NA
• Better failure behavior now when non-acceptable rows
  parameter value given
• Added in all type checks for parameters across get_*() functions
• Changed behavior across all get_*() functions to behave the
  same when ask = FALSE, rows = 1 and ask = TRUE, rows = 1 as these
  should result in the same outcome. (#627) thanks @zachary-foster !
• Fixed direct match behavior so that when there's multiple results
  from the data provider, but no direct match, that the functions don't
  give back just NA with no inication that there were multiple matches.
• Please let me know if any of these changes cause problems for your
  code or package.

NEW FEATURES

• Change comm2sci() to S3 setup with methods for character, uid,
  and tsn (#621)
• iucn_status() now has S3 setup with a single method that only handles
  output from the iucn_summary() function.

MINOR IMPROVEMENTS

• Add required key parameter to fxn iucn_id() (#633)
• imrove docs for sci2comm(): to indicate how to get non-simplified
  output (which includes what language the common name is from) vs.
  getting simplified output (#623) thanks @glaroc !
• Fix to sci2comm() to not be case sensitive when looking for matches
  (#625) thanks @glaroc !
• Two additional columns now returned with eol_search(): link and content
• Improve docs in eol_search() to describe returned data.frame
• Fix bold_bing() to use new base URL for their API
• Improved description of the dataset rank_ref, see ?rank_ref

BUG FIXES

• Fix to downstream() via fix to rank_ref dataset to include
  "infraspecies" and make "unspecified" and "no rank" requivalent.
  Fix to col_downstream() to remove properly ranks lower than
  allowed. (#620) thanks @cdeterman !
• iucn_summary: changed to using rredlist package internally.
  sciname param changed to x. iucn_summary_id() now is
  deprecated in favor of iucn_summary(). iucn_summary() now has a
  S3 setup, with methods for character and iucn (#622)
• Added "cohort" to rank_ref dataset as that rank sometimes used
  at NCBI (from bug reported in ncbi_downstream()) (#626)
• Fix to sci2comm(), add tryCatch() to internals to catch
  failed requests for specific pageid's (#624) thanks @glaroc !
• Fix URL for taxa for NBN taxonomic ids retrieved via
  get_nbnid() (#632)