Added CHANGELOG.

Author: sideshowbarker

CHANGELOG

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+25 August 2014
+  - added support for the <picture> element
+  - improved ARIA support for various table elements
+  - made refinements to outline handling
+  - added experimental warnings for some heading/outline issues
+  - improved checking for meta@name and lin@rel values
+  - CLI now exits with 1 if any errors are found
+  - CLI no longer says "XHTML element" in error messages
+  - switched to galimatias for URL checking
+  - updated to latest ICU4J
+  - release now includes WAR file
+
+02 February 2014
+  - initial vnu.jar release