Strip method:publish, fix #502

CHANGELOG.rst

@@ -9,6 +9,11 @@ Package maintainers and users who have to manually update their installation
 may want to subscribe to `GitHub's tag feed
 <https://github.com/pimutils/vdirsyncer/tags.atom>`_.
 
+Version 0.16.0
+==============
+
+- Strip ``METHOD:PUBLISH`` added by some calendar providers.
+
 Version 0.15.0
 ==============
 

vdirsyncer/vobject.py

@@ -162,6 +162,8 @@ def _split_collection_impl(item, main, inline, items, ungrouped_items):
 
         wrapper.subcomponents.append(item)
     elif item.name in (u'VCALENDAR', u'VADDRESSBOOK'):
+        if item.name == 'VCALENDAR':
+            del item['METHOD']
         for subitem in item.subcomponents:
             _split_collection_impl(subitem, item, inline, items,
                                    ungrouped_items)