[20180913] I submit a bonus of 15$ for fix this bug,please see:
https://www.bountysource.com/issues/45064165-docear-can-t-get-the-annotation-of-rectangle-or-round
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The pdf document have 2 annotation, one is rectangle annotation ,another is sticky note, and docear can only get the last one, docear can't get the rectangle annotation,please see screenshot.