Added User.as_dict
Let testing login/logout return user info
Added sid verification to html form
Changed some endpoints to admin required only
Added TaoblogTestCase.add_post
Added some tests for posts

- added test_feed
- added test_render_posts_and_archive
- added test_render_post_by_permlink
- added test_render_post
- added test_render_post_editing
- removed test_home