Fix a bug of backward retrieval of favorites timeline.
Thanks to the anonymous person who reported the problem.

* twittering-mode.el: Fix a bug of backward retrieval of
favorites timeline. The functions, `twittering-goto-next-status'
and `twittering-goto-previous-status', did nothing for favorites
timeline. They now treat favorites timeline as they treat other
timelines. Thanks to the anonymous person who reported the
problem.
(twittering-goto-next-status): Remove a special action for
favorites timeline.
(twittering-goto-previous-status): likewise.
Update 'README.markdown'.

* README.markdown: Add explanations of major configurations and
others.
Update the regexp for extracting an ID from a tweet.

* twittering-mode.el: Update the regexp for extracting an ID from
a tweet.
(twittering-extract-id-from-url): update the regexp for extracting
an ID from a tweet.
Avoid rendering same tweets repeatedly.

* twittering-mode.el: Avoid rendering same tweets repeatedly. The
function `twittering-render-timeline' rendered given repeated
tweets as is. Since a merged timeline may include one tweet
multiple times, such a tweet was rendered multiple times.
(twittering-render-timeline): skip repeated tweets.
Fix the jojo-mode that caused an error.
Thanks to the anonymous person who reported the problem.

* twittering-mode.el: Fix the jojo-mode that caused an error when
the condition of automatically posting a tweet was satisfied.
Thanks to the anonymous person who reported the problem.
(twittering-post-predicted-message-like-jojo): fix variable name.
Fix a return value of `twittering-render-replied-statuses'.
Thanks to Ikumi Keita who reported the problem.

* twittering-mode.el: Fix a return value of
`twittering-render-replied-statuses'. The function returns nil
without regard to whether a tweet is rendered or not. Thanks to
Ikumi Keita who reported the problem.
(twittering-render-replied-statuses): fix a return value.
Support different intervals of retrieving timelines.

* twittering-mode.el: Support different intervals of retrieving
timelines.
(twittering-relative-retrieval-interval-alist): new variable.
(twittering-relative-retrieval-count-alist): new variable.
(twittering-retrieve-timeline): reset the retrieval count.
(twittering-start): update all active timelines forcibly once.
(twittering-get-relative-interval): new function.
(twittering-get-retrieval-count): new function.
(twittering-set-retrieval-count): new function.
(twittering-initialize-retrieval-count): new function.
(twittering-update-active-buffers): reduce retrievals according to
the variable `twittering-relative-retrieval-interval-alist'.
Merge remote branch 'upstream/master' into develop

Conflicts:
	twittering-mode.el
fix
refactor utc_offset
Merge branch 'develop'