bug#18687: mw: modular MediaWiki interface for Emacs

[Ivan Shmakov]

        The following fixes to the code are now available from the usual
        location [1, 2], in the fixes-x54a46898 branch.

 4f203  Fixed type handling in ‘vc-mw-unprefix-revision’,
        ‘vc-mw-buffer-state’.
 2eaba  Use the new ‘eww-data’ variable and the fifth argument to
        ‘eww-display-html’.
 21410  Support new two-argument call interface to ‘vc-mw-checkin’.
 89180  Allow requesting for a specific revision in
        ‘mw-buffer-page-query’.

        The first one eliminates some failure modes from the vc-mw.el
        code, first and foremost the handling of nil value for
        mw-buffer-page-revision (as in: when starting a new page.)

        The latter two provide compatibility with the current versions
        of eww.el and vc.el, respectively.

        The last one extends the mw-buffer-page-query interface as
        necessary for the yet to be published vc-mw.el changes.

[1] https://am-1.org/~ivan/archives/git/mw-el-2014.git
[2] https://am-1.org/~ivan/archives/git/gitweb.cgi?p=mw-el-2014.git

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