Create jsondiff tool to capture diffs between two JSON expectations files.

tools/tests/jsondiff/input/old.json

Index: tools/tests/jsondiff/input/old.json
===================================================================
--- tools/tests/jsondiff/input/old.json	(revision 0)
+++ tools/tests/jsondiff/input/old.json	(revision 0)
@@ -0,0 +1,22 @@
+{
+   "expected-results" : {
+      "identical.png" : {
+         "allowed-digests" : [
+            [ "bitmap-64bitMD5", 1111111 ]
+         ],
+         "ignore-failure" : false
+      },
+      "differing.png" : {
+         "allowed-digests" : [
+            [ "bitmap-64bitMD5", 888888888 ]
+         ],
+         "ignore-failure" : false
+      },
+      "missing-from-new.png" : {
+         "allowed-digests" : [
+            [ "bitmap-64bitMD5", 44444444 ]
+         ],
+         "ignore-failure" : false
+      }
+   }
+}