The classes are named using the format: `{property}-{sides}-{size}`
Where *property* is one of:
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* `m` - for classes that set `margin`
* `p` - for classes that set `padding`
Where *sides* is one of:
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* `t` - for classes that set `margin-top` or `padding-top`
* `b` - for classes that set `margin-bottom` or `padding-bottom`
* `l` - for classes that set `margin-left` or `padding-left`
* `a` - for classes that set a `margin` or `padding` on all 4 sides of the element
Where *size* is one of:
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* `0` - for classes that eliminate the `margin` or `padding` by setting it to `0`
* `1` - (by default) for classes that set the `margin` or `padding` to `$spacer-x` or `$spacer-y`
* `2` - (by default) for classes that set the `margin` or `padding` to `$spacer-x * 1.5` or `$spacer-y * 1.5`