Cleaner meta tags

[stuartjmoore]

Allow more than one meta name to share the same value.

<html:meta types="description, twitter:description, og:description" value="This is an example of description for Google, Twitter, and Facebook">

[stuartjmoore]

Scratch those commas and maybe the s in types; should be closer to the class list.

[OscarGodson]

I like it. Can't you already do this except that other sites, like twitter, expect that you make these separate?

[philandy]

Hmmm, why not:

<html:link src="meta/meta.html" title="Main Meta" type="text/meta" />

[cshaa]

@stuartjmoore - You can make a pull request. @philandy - Not really a link, I think include or using would be better - https://github.com/OscarGodson/HTML6/issues/5