v2.13

2018-09-15 Show Reference Image and Scope Image seperately.
Make sure no thread runnig after program exits.
Compress images in PDF in batching way.
Snap Tool for Weibo, backup contents of any weibo account automatically. Duration can be set. Both PDF files and html files can be saved. Weibo pages are loaded dynamically, so locally backed pages can not be loaded and shown correctly. They are backed just for texts in the pages. This tool might fail to work when weibo would change the accessing channel of pages in future. Who know~