V0.5.11 released

Features:

• Coco export includes bounding boxes
• Support to upload tags to videos with new importer csv_tags_video
• removed pycocotool dependency
• Flag to download images into folders --folders

Bug fixes

• pulling an export of a different format than darwin json now gives a proper error message

Breaking change

--as-video has been removed and instead there is a new flag --frames that is the inverse