Updated hourly_corridor_travel_times()
Removed limit in loop query and set max_items to large number for single query.
Reduced the number of grouper process to just the CPU count as there may not be that many station in between.
Fixed write grouped result to CSV.
Uncommented function call to query_to_5_samples()
Updated hourly_corridor_travel_times()
Removed TODO for changing AWS SelectResultSet iterator to bulk select as the iterator already performing bulk select.
However, AWS limit each query, so the iterator handles itself to retrieve more data.
Remove the max_items limit as that was though to be the limiting factor as to how AWS query the data.
Fixed the indexing for writing out the mapped result data
Split the loop data query from by station to by detector to improve parallel query against AWS.