start work

src/calibre/gui2/viewer/footnote.py

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+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
+
+class Footnotes(object):
+
+    def __init__(self):
+        self.clear()
+
+    def clear(self):
+        self.url_cache = {}
+