Reorganize XEP-0004.

Changes:
    May now use underscored method names
    form.field is replaced by form['fields']
    form.get_fields no longer accepts use_dict parameter, it always
        returns an OrderedDict now
    form.set_fields will accept either an OrderedDict, or a list
        of (var, dict) tuples as before.
    Setting the form type to 'submit' will remove extra meta data
        from the form fields, leaving just the 'var' and 'value'
    Setting the form type to 'cancel' will remove all fields.

sleekxmpp/plugins/xep_0004/stanza/__init__.py

@@ -0,0 +1,10 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2011 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.xep_0004.stanza.field import FormField, FieldOption
+from sleekxmpp.plugins.xep_0004.stanza.form import Form