Nilearn css template for the examples gallery

This pull request ports the CSS templating of Nilearn into the example gallery
 it also removes the jquery function that highlights mouse hovered example
Modularizes the CSS file to later simplify integration to Sphinx-Gallery
This is css3. The things one can do with css3 are crazy. 

<div>-------- Original message --------</div><div>From: Andreas Mueller <notifications@github.com> </div><div>Date:02/12/2014  15:08  (GMT+01:00) </div><div>To: scikit-learn/scikit-learn <scikit-learn@noreply.github.com> </div><div>Cc: Gael Varoquaux <gael.varoquaux@normalesup.org> </div><div>Subject: Re: [scikit-learn] Nilearn css template for the examples gallery  (#3925) </div><div>
</div>In doc/themes/scikit-learn/static/gallery.css:

> +
> +div.thumbnailContainer div.figure {
> +    float: left;
> +    margin: 10px 11px 7em 11px;
> +    -webkit-border-radius: 10px;
> +    -moz-border-radius: 10px;
> +    border-radius: 10px;
> +    border: 2px solid #FFF;
> +    background-color: #FFF;
> +    width: 150px;
> +    height: 100px;
> +    -webkit-background-size: 150px 100px;
> +    -moz-background-size: 150px 100px;
> +}
> +
> +*[tooltip] {
stupid question: what is this? not plain CSS, I take it?

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