Support cross references on images with title

[xcoulon]

for example:

see <<thecookie>>
			
[#thecookie]
.A cookie
image::cookie.jpg[]

should render as:

<div class="paragraph">
<p>see <a href="#thecookie">A cookie</a></p>
</div>
<div id="thecookie" class="imageblock">
<div class="content">
<img src="cookie.jpg" alt="cookie">
</div>
<div class="title">Figure 1. A cookie</div>
</div>