Update and rename CHANGELOG to CHANGELOG.md

Structure of document.

Author: Bruno Pulis

CHANGELOG

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+## v1.4* (2011-12-03)
+
+* Made ARIA properties the means by which data about the tab interface is stored (rather than internal variables)
+* Cleaned up some of the code and optimized it
+* Made sure that even if an iterator isn’t supplied, the code works well
+
+## v1.3* (2011-04-05)
+
+* Adjusted tabbing to remove the tabpanels from the tab flow
+* Added "Enter" functionality to focus tabpanel from tab
+* Added ability to circle back to the beginning (or end) of the tablist when the end is reached
+
+## v1.2* (2010-09-29)
+
+* move to HTML5 section elements from divs
+* added HTML5 header to the allowed header indication elements
+
+## v1.1* (2010-09-29)
+
+* Change to ARIA spec: adding aria-controls
+
+## v1.0* (2010-08-11)
+
+* Switch to 1.0
+* Fix to ARIA implementation
+* Adding minified version
+
+## v0.4.4* (2009-07-17)
+
+* Made a few tweaks to the ARIA stuff
+
+## v0.4.3* (2009-06-28)
+
+* Simplified some of the JavaScript by reducing variables, combining declarations, etc.
+* Cleaned up the class names a bit
+* Adjusted the demo to reflect the new class names and to use namespaced CSS
+
+## v0.4.2* (2009-04-20)
+
+* Changed the source order for the tabs (so they come before the panels, which will be more helpful in ARIA use)
+* Changed the keyboard trigger to onkeydown
+
+## v0.4.1* (2009-04-20)
+
+* Added support for nested elements within a tab
+
+## v0.4* (2009-04-20)
+
+* Added support for ARIA Roles and States
+
+## v0.3* (2007-06-17)
+
+* Removed Prototype dependency, made most methods and properties private
+
+## v0.2* (unreleased)
+
+## v0.1* (2006-12-07)
+
+* Initial script