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

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+Definition Lists
+----------------
+
+Summary
+-------
+
+The Definition List Extension adds the ability to create definition list in
+Markdown documents.
+
+This extension is included in the standard Markdown library.
+
+Syntax
+------
+
+Definition lists are defined using the syntax established in 
+[PHP Markdown Extra][php].
+
+[php]: http://www.michelf.com/projects/php-markdown/extra/#def-list
+
+Thus, the following text (taken from the above referenced PHP documentation):
+
+    Apple
+    :   Pomaceous fruit of plants of the genus Malus in 
+        the family Rosaceae.
+
+    Orange
+    :   The fruit of an evergreen tree of the genus Citrus.
+
+will be rendered like so:
+
+    <dl>
+    <dt>Apple</dt>
+    <dd>Pomaceous fruit of plants of the genus Malus in 
+    the family Rosaceae.</dd>
+
+    <dt>Orange</dt>
+    <dd>The fruit of an evergreen tree of the genus Citrus.</dd>
+    </dl>
+
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> html = markdown.markdown(text, ['def_list'])
+
+To use with other extensions, just add them to the list, like this:
+
+    >>> html = markdown.markdown(text, ['def_list', 'footnotes'])
+
+The extension can also be called from the command line using Markdown's `-x` 
+parameter:
+
+    markdown.py -x def_list source.txt > output.html