Start tidyverse migration

Change-Id: Ifc972de789c22e2ff43159740d7f1fa7125e1ef2
diff --git a/R/reexports.R b/R/reexports.R
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+
+#' Pipe operator
+#'
+#' See \code{magrittr::\link[magrittr:pipe]{\%>\%}} for details.
+#'
+#' @name %>%
+#' @rdname pipe
+#' @keywords internal
+#' @export
+#' @importFrom magrittr %>%
+#' @usage lhs \%>\% rhs
+NULL
+#' @importFrom dplyr mutate
+#' @export
+dplyr::mutate
+#' @importFrom dplyr select
+#' @export
+dplyr::select
+#' @importFrom dplyr group_by
+#' @export
+dplyr::group_by
+#' @importFrom dplyr summarise
+#' @export
+dplyr::summarise
+#' @importFrom tidyr complete
+#' @export
+tidyr::complete
+#' @importFrom lubridate year
+#' @export
+lubridate::year