Improved annotation tool using planet labs API with optional mechanical turk hooks

[BradNeuberg]

An improved annotation tool for drawing bounding boxes for images taken from the Planet Labs API with quality controls and the ability to optionally work via Mechanical Turk, inspired by https://www.dropbox.com/s/noa86f8td6bg7r3/Crowdsourcing%20Annotations%20for%20Visual%20Object%20Detection.pdf?dl=0