Add LTR & mixed direction test files

Author: tfmorris

testing/DuTillet1004Pg2LG.jpg

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+This file documents the original source of various examples used for testing.
+
+hebrew.png - Sample from Hebrew OCR with Nikud project by Adi Oz and Vered Shani
+    project URL - http://www.cs.bgu.ac.il/~nlpproj/hocr/
+    direct link to image - http://www.cs.bgu.ac.il/~nlpproj/hocr/images/image00.png
+
+hebtypo.jpg - Sample from OCR and Hebrew on the Web project at Universiteit van Amsterdam
+    project URL - http://cf.uba.uva.nl/en/collections/rosenthaliana/menasseh/hebtypo.html
+    direct link to image - http://cf.uba.uva.nl/en/collections/rosenthaliana/menasseh/gif/hebtypo.jpg
+
+DuTillet1004Pg2LG.jpg -  Sample from Hebrew Matthew Project with parallel texts in Hebrew & Greek
+        as well as English page/chapter labels with Arabic numerals - test with -l heb+grc+eng
+    project URL - http://www.torahresource.com/Dutillet.html
+    direct link to image - http://www.torahresource.com/DuTillet/DuTillet1004Pg2LG.jpg
+
+hebrew-nikud-genesis-1-2.png - Genesis 1-2 Hebrew example from OCR forum
+    forum post - https://community.logos.com/forums/p/16124/277997.aspx
+    direct link to image - https://community.logos.com/cfs-filesystemfile.ashx/__key/CommunityServer.Discussions.Components.Files/77/4578.Gen.png
+