Log message

Adds support for sending atom over xmpp.
Also, refactors some of the template code to use a similar pattern to the
common/templates/stream.html code.
Review URL: http://rietku.appspot.com/7002

	Modify	/trunk/common/api.py	diff
	Modify	/trunk/common/protocol/xmpp.py	diff
	Add	/trunk/common/templates/im/im_comment.atom	diff
	Modify	/trunk/common/templates/im/im_comment.html	diff
	Modify	/trunk/common/templates/im/im_comment.txt	diff
	Add	/trunk/common/templates/im/im_entry.atom	diff
	Modify	/trunk/common/templates/im/im_entry.html	diff
	Modify	/trunk/common/templates/im/im_entry.txt	diff
	Modify	/trunk/common/templates/stream_entry.html	diff
	Modify	/trunk/common/templatetags/format.py	diff
	Modify	/trunk/common/test/util.py	diff
	Modify	/trunk/components/dummy_xmpp_service/__init__.py	diff