(mixi-echo-cache): New variable.

(mixi-echo-cache): New variable.
(mixi-make-echo): New function.
(mixi-echo-url-regexp): New constant.
(mixi-make-echo-from-url): New function.
(mixi-echo-p): New macro.
(mixi-echo-page): Ditto.
(mixi-echo-owner-nick-regexp): New constant.
(mixi-echo-content-regexp): Ditto.
(mixi-realize-echo): New function.
(mixi-echo-owner): New accessor method.
(mixi-echo-post-time): Ditto.
(mixi-echo-content): Ditto.
(mixi-echo-set-content): Ditto.
(mixi-echo-list-page): New macro.
(mixi-echo-list-regexp): New constant.
(mixi-get-echoes): New function.
(mixi-new-echo-list-page): New macro.
(mixi-new-echo-list-regexp): New constant.
(mixi-get-new-echoes): New function.
(mixi-post-echo-page): New macro.
(mixi-echo-post-succeed-regexp): New constant.
(mixi-post-echo): New function.