Add an example of manipulating real DOM element

[aknuds1]

I couldn't find any documentation on manipulating real DOM elements (i.e. non-virtual), which can be necessary at least to integrate with 3rd party libraries. So I wrote an example on how to do it (based on virtual-dom's tests).

[Raynos]

@aknuds1

• https://github.com/Raynos/mercury/blob/master/docs/faq.md#how-do-i-update-custom-properties
• https://github.com/Raynos/mercury/blob/master/docs/faq.md#how-do-i-do-custom-rendering

This one is cool though; do you want to add a widget to this too ?

[aknuds1]

@Raynos Aha, hadn't noticed those. I can look into the widget thing, thanks.

[aknuds1]

@Raynos Having just read up on Mercury widgets, do you suggest I add one to my example as an alternative approach for affecting the DOM?

[aknuds1]

@Raynos I went ahead and added an alternative approach of using a widget to my example. Let me know if you had something else in mind.

[aknuds1]

@Raynos Does it look OK to you now? Changing node.style.color should be correct JavaScript, AFAICT.

[Raynos]

Lgtm

[aknuds1]

Thanks @Raynos :)