* Add rapidjson_sax.h . * Add nlohmann_json_sax.h . Fix typos distinct_user_id/nlohmann_json_sax.h, find_tweet/rapidjson.h and find_tweet/rapidjson_sax.h . * Add extra check for id key when looking for find_id.
* Add rapidjson_sax for distinct_user_id * Add nlohmann_json_sax.h for distinct_user_id * Add flags for RapidJSON. * Fix revisions. * Fix revisions again. * Replace strcpy with memcpy. Increase performance fix.