Masonry directive as an element doesn't create columns

[vrockai]

In the README.md, the masonry directive is used as an element. It doesn't work properly (creates only a single column) for me when I use it as E directive like:

<masonry>
    ...
</masonry>

but it works well when used as A directive like:

<div masonry>
    ...
</div>

[elstanto]

This also happened to me, using bower install.

[jodytate]

I can reproduce this with the demo. The documentation does seem to be at odds. It says:

You have to include the masonry attribute on the element holding the bricks.

But then the examples that follow use masonry as an element.

Seems like a pull request could:

• fix the docs
• change restrict: AE to restrict: A

@passy Unless there's a bug disallowing use of masonry as an element, I could submit some changes.