First pass on point changefeeds.
Debugging some changefeed crashes.
Merged from next.
Added keyspec to changefeed_stamp_t.
point changefeeds seem to be working
Fixed changefeed RSI.
Refactoring point changefeeds to remove the variant.
Done with point changefeed refactor, but the variant ended up hanging around as an interface.
Point changefeeds seem to be done.
Merge branch 'next' into mlucy_point_changefeeds
Removed old debugfs.
Removed unused variable.
Removed dead class.
Removed typedef from changefeed code.
Added some `assert_thread`s in changefeed.cc
Style issues.
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Resolved merge conflicts.