Simplify

[okonomiyaki3000]

The size and color classes (``la-2x, la-3x`, `la-dark`, etc.) can (and should) be removed. These values should just come from the inherited `color` and `font-size` properties.

As it is, of course I can set the color to anything I like without relying on la-dark or la-light but this only works on the loader element itself.

works

<div class="la-ball-spin-clockwise my-custom-color-class">
    ...
</div>

doesn't work

<div class="loading-block-wrapper my-custom-color-class">
    <h2>Please wait a minute...</h2>
    <div class="la-ball-spin-clockwise">
        ...
    </div>
</div>

Sizing is a bigger issue because it's currently limited to the 4 sizes provided. In many cases it would be trivial to base the size of the loader elements on the inherited font size by using em. I can't say for sure that this would work with every animation in this library but, from what I've seen, it definitely works with some (probably most) of them.

[danielcardoso]

@okonomiyaki3000 thanks for comment.
I will check what you said in the next days and I will try to change the sizes classes :)

Once again thanks.