v0.5.8

• Fixed annotation simplification bug
• Fixed PaperJS coordinate not in point format
• Fixed grab indicator showing all the time
• Fixed selected annotation being saved
• Fixed image not always loading properly
• Fixed coco format for segments with only 2 points
• Added simplify annotations on saving
• Added file name and size as text on the image border
• Added image view side menu
• Added more data to hover text