[O] ox-texinfo doesn't handle inline images

[Vaidheeswaran C]

In:

    #+NAME: fig1
    #+CAPTION: Screen capture
    [[./emacs-24.5.1-startup-screen-annotated.png]]


Buggy out:

    @uref{./emacs-24.5.1-startup-screen-annotated.png}


Desired out:

     @float Figure,fig1
     @image{./emacs-24.5.1-startup-screen-annotated,150mm,,,png}
     @c @shortcaption{Screen capture}
     @caption{Screen capture.}
     @end float


Reference:


http://www.gnu.org/software/texinfo/manual/texinfo/html_node/Special-Displays.html

http://www.gnu.org/software/texinfo/manual/texinfo/html_node/Floats.html#Floats

http://www.gnu.org/software/texinfo/manual/texinfo/html_node/Images.html#Images

Additional notes:

    (a) I also see no reference to "@listoffloats", for example.
    There is a some scope for further imporvement around these areas.

    (b) Without Image width (i.e., image scaling) the image in the PDF
    output gets cropped.