0.1.0

Added

• Add the ExpirableObject class to the helpers module.
• Add the functions utctimestamp_tzaware, utcnow_tzaware, utcfromtimestamp_tzaware, floor_seconds, utc_date_parse, utc_from_local_date_parse, utcdatetime_tzaware to the helpers module.
• Add dependency to the python-dateutil library.
• Add the functions time_window_from_timestamps and time_window_to_timestamps to the time_window module.
• Add the methods split_per_week and split_per_month to the TimeWindow class.