0.8.7 (12.06.2018)

fix long-standing bug with broken html rendering in knitr (issue #6)
add '..p' and '..f' - perl regular expression/fixed pattern selectors. Also 'mrset_p', 'mrset_f', 'mdset_p', 'mdset_f' are provided.
add ..data shortcut for entire data.frame in 'use_labels'
fix awful bug with incorrect nesting multiple response on multiple response ('nest' function)
more exports from data.table
fix 'add_columns' for data.table
fix 'do_if' for data.table
fix 'w_cor' - now diag elements always equal to one
add 'split_by' - alias for 'split_separate'

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