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#' enigma, an R client for Enigma.io
#'
#' Enigma holds government data and provides a really nice set of APIs for
#' data, metadata, and stats on each of the datasets. That is, you can
#' request a dataset itself, metadata on the dataset, and summary
#' statistics on the columns of each dataset.
#'
#' @section package API:
#'
#' \itemize{
#' \item \code{\link[enigma]{enigma_data}} - Fetch and dataset, and filter on
#' columns or rows.
#' \item \code{\link[enigma]{enigma_metadata}} - Get metadata on datasets.
#' \item \code{\link[enigma]{enigma_stats}} - Get columnwise statistics on
#' datasets.
#' \item \code{\link[enigma]{enigma_fetch}} - Get gzipped csv of a dataset.
#' Goes along with \code{\link[enigma]{enigma_read}}
#' \item \code{\link[enigma]{rate_limit}} - Get columnwise statistics on
#' datasets.
#' }
#'
#' @section Authentication:
#' An API key is required to use this package. You can supply your key in each
#' function call, or store in your \code{.Renviron} file like
#' \code{ENIGMA_KEY=your key)}, or in your \code{.Rprofile} file as
#' \code{options(enigmaKey = "<your key>")}, Obtain an API key by creating
#' an account with Enigma at \url{http://enigma.io}, then obtain an API key
#' from your account page.
#'
#' @importFrom plyr rbind.fill
#' @importFrom xml2 read_xml
#' @name enigma
#' @docType package
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