Add an opt-in parser tailored to rectangular data to improve the performance of large queries#148

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atheriel wants to merge 3 commits intojeroen:masterfrom atheriel:add-flat-cursor

+691-23

Commits on May 15, 2019

Adds a new version of mongo_cursor_next_page() for rectangular data.
atheriel
committed
Modifies find() to take a new 'flat' parameter.
atheriel
committed
Adds optional usage of dplyr::bind_rows() or data.table::rbindlist().
atheriel
committed