Bump version

Bug correction in sunite()

Taking spec_tbl_df and groupedData objects into account in is_dtx()/a…

…s_dtx()

list_tidy_functions() corrected

Most of {dplyr} and {tidyr} verbs are implemented as tidy "t..." or s…

…peedy "s..." functions.

collect_dtx() and co, and better management of grouped_df objects wit…

…h automatic ungroup().

as_matrix correction for tibbles