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

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+Abbreviations
+-------------
+
+Summary
+-------
+
+The Markdown Abbreviation Extension adds the ability to define abbreviations. 
+Specifically, any defined abbreviation is wrapped in  an `<abbr>` tag.
+
+The Abbreviation extension is included in the standard Markdown library.
+
+Syntax
+------
+
+Abbreviations are defined using the syntax established in 
+[PHP Markdown Extra][php].
+
+[php]: http://www.michelf.com/projects/php-markdown/extra/#abbr
+
+Thus, the following text (taken from the above referenced PHP documentation):
+
+    The HTML specification 
+    is maintained by the W3C.
+        
+    *[HTML]: Hyper Text Markup Language
+    *[W3C]:  World Wide Web Consortium
+
+will be rendered like so:
+
+    <p>The <abbr title="Hyper Text Markup Language">HTML</abbr> specification 
+    is maintained by the <abbr title="World Wide Web Consortium">W3C</abbr>.</p>
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> import markdown
+    >>> text = """
+    ... Some text with an ABBR.
+    ...
+    ... *[ABBR]: Abbreviation
+    ... """
+    >>> html = markdown.markdown(text, ['abbr'])
+
+To use with other extensions, just add them to the list, like this:
+
+    >>> html = markdown.markdown(text, ['abbr', 'footnotes'])
+
+Abbreviations can also be called from the command line using Markdown's `-x` 
+parameter, like so:
+
+    markdown.py -x abbr source.txt > output.html