Add meta tag with charset information to application layout.

Previously, our default HTML would validate properly, but would generate
a warning: it doesn't declare a character encoding.

According to [the spec][encoding-spec], if you don't specify an
encoding, a 7 step algorithm happens, with a toooon of sub-steps. Or, we
could just actually specify it.

Since everything else in Rails assumes UTF-8, we should make sure pages
are served with that encoding too. This meta tag is the simplest way to
accomplish this.

More resources:

* http://blog.whatwg.org/the-road-to-html-5-character-encoding
* http://www.w3.org/International/tutorials/tutorial-char-enc/
* http://validator.w3.org/

[encoding-spec]: http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#determining-the-character-encoding

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