Switch breakpoint name from data attribute to content attribute.

[jonathantneal]

It is generally accepted that the content attribute represents the value of the meta element.

<meta name="breakpoint" content="phone" media="(max-width: 480px)">

http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#the-meta-element http://www.w3.org/wiki/HTML/Elements/meta https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta

name — Metadata name content — Value of the element

[benschwarz]

I'm good with this… not sure why I made the original decision with the data attribute

[jonathantneal]

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[benschwarz]