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

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+Footnotes
+=========
+
+Summary
+-------
+
+An extension to Python-Markdown that adds footnote syntax. This extension has 
+been included with Python-Markdown since 1.7 and should be available to anyone 
+who has a typical install of Python-Markdown.
+
+Syntax
+------
+
+Python-Markdown's Footnote syntax follows the generally accepted syntax of the 
+Markdown community at large and almost exactly matches [PHP Markdown Extra][]'s
+implementation of footnotes. The only differences involve a few subtleties in 
+the output.
+
+[PHP Markdown Extra]: http://michelf.com/projects/php-markdown/extra/#footnotes
+
+Example:
+
+    Footnotes[^1] have a label[^label] and a definition[^!DEF].
+
+    [^1]: This is a footnote
+    [^label]: A footnote on "label"
+    [^!DEF]: The definition of a footnote.
+
+A footnote definition may contain multiple lines, paragraphs, code blocks, 
+blockquotes and most any other markdown syntax. The additional line simply 
+must be indented at least an additional four spaces.
+
+    [^1]: The first paragraph of the definition.
+
+        Paragraph two of the definition.
+
+        > A blockquote with
+        > multiple lines.
+
+            a code block
+
+        A final paragraph.
+
+By default, the footnote definitions are placed at the end of the resulting 
+HTML document. However, you may want the footnotes in another location within 
+the document. Simply place the following text at that location within your 
+markdown document (See how to configure this text below):
+
+    ///Footnotes Go Here///
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> html = markdown.markdown(text, ['footnotes'])
+
+To configure the place marker for footnote definitions (just be sure not to 
+use any existing markdown syntax):
+
+    >>> html = markdown.markdown(text, ['footnotes(PLACE_MARKER=+++my marker+++)'])
+