Support for CSS classes in markdown

[m3t]

Maybe you would like to consider adding the plugin markdown-it-classy.
On the face of it, the plugin does what it's supposed to in my hexo installation.

Example:

- so
- are
- ul tags
{classy}

converts to

<ul class="classy">
    <li>so</li>
    <li>are</li>
    <li>ul tags</li>
</ul>

[celsomiranda]

I don't really have the time right now to implement new stuff. 😞 I barely have the time to properly maintain it. :/

If someone else would do it, and the proper tests, I'll merge though.

[m3t]

I'm sorry for that,
but hopefully there's time to have a look at
#27

[celsomiranda]

I've been trying to fix the remaining bug, but I've not been able to do it. Would prefer to merge when all is good.

[noraj]

This is not supported by markdown so whit a markdown renderer will do that ?

[stevenjoezhang]

Closing as not considered part of the current focus.