fixed pb doc example (c.f. Issue #679)
Merge branch '679_pb_docs' into next
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Made protob_t use protob_term_t to save memory.
Made protob_t support refcounting a Query or Term, but did not yet use it for any Query objects.
Made the protob_server_t allow construction of protob_t<Query>, made use of said feature to construct protob_t<Query>.
Merge branch 'sam_no_ptr_bag' of github.com:rethinkdb/rethinkdb into sam_no_ptr_bag
Merge branch 'next' into sam_no_ptr_bag