client-libraries/cpp/TODO

   1 + finish command implementations
   2 = finish unit tests
   3   Only a few left, to test the SORT command's edge cases (e.g. BY pattern)
   4 + determine if we should not use bool return values and instead throw redis_error. (latter).
   5 + maybe more fine-grained exceptions (not just redis_error but operation_not_permitted_error, etc.)
   6 - benchmarking
   7 - consistent hashing?
   8 - make all string literals constants so they can be easily changed (minor)
   9 - add conveniences that store a std::set in its entirety (same for std::list, std::vector)