Added documentation for Extra Extension and all the extentions it supports. Still need to do non-extra extensions.

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+Python-Markdown Extra
+=====================
+
+Summary
+-------
+
+A compilation of various Python-Markdown extensions that (mostly) imitates
+[PHP Markdown Extra](http://michelf.com/projects/php-markdown/extra/).
+
+The supported extensions include:
+
+* [[Abbreviations]]
+* [[Definition_Lists]]
+* [[Fenced_Code_Blocks]]
+* [[Footnotes]]
+* [[HeaderId]]
+* [[Tables]]
+
+See each individual extension for syntax documentation. Extra and all it's 
+supported extensions are included in the standard Markdown library.
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> import markdown
+    >>> html = markdown.markdown(text, ['extra'])
+
+In the unlikely event that one or more of the supported extensions are not
+available for import, Markdown will simply continue without that
+extension. If you would like to be notified of such failures,
+you may set Python-Markdown's logger level to "WARN".
+
+There may be additional extensions that are distributed with
+Python-Markdown that are not included here in Extra. Those extensions
+are not part of PHP Markdown Extra, and therefore, not part of
+Python-Markdown Extra. If you really would like Extra to include
+additional extensions, we suggest creating your own clone of Extra
+under a different name (see [[Writing Extensions]]). You could also 
+edit the `extensions` global variable defined in the source, but be 
+aware that such changes may be lost when you upgrade to any future 
+version of Python-Markdown.