Update list for Dr.Explain

Dr.Explain 5.4.1031 changelog from October 3, 2016

Dr.Explain 5.1.1004 from April 16, 2015

Multiuser work;Imroved editor;Imroved annotation editor

Dr.Explain 4.11.863 changelog from June 3, 2014

Dr.Explain 4.10.820 from September 16, 2013

Title page editor;TOC editor;

Dr.Explain 4.9.720 changelog from August 7, 2013

Video support;PDF Preview;Social Networks support;User comments

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