GitHub 301 redirects the URL without a trailing slash to the URL with a
trailing slash.

* Consistent use of tense.
* Small change to use common comment style.

The Android 4.0.* work around - `html input[type="button"]` - requires
the addition of `html` to the selector for disabled inputs, otherwise
disabled button inputs still have the `pointer` cursor.

The HTML Working Draft has added `main` as a new element.

Firefox uses different `box-sizing` and `height` values to all other
browsers. Firefox doesn't currently support `box-sizing` without the
`-moz-` prefix, so we use both the vendor-prefixed and unprefixed
properties to ensure that it matches the `content-box` value of other
browsers. It also requires the `height` to be set to `0`.

Known issue: this does not normalize IE 6/7 as `hr` cannot be reliably
styled in those browsers.

By default, browsers set `text-transform:none` on most form controls in
order to prevent `text-transform` being inherited from ancestor nodes.

However, the `button` and `select` elements are exceptions.

* Firefox and Opera do not apply `text-transform:none` to `select`.

* Chrome, Safari, and IE 6+ do not apply `text-transform:none` to
  `button.

It's not suitable to set `text-transform:inherit` because all other form
elements intentionally avoid it. Safari and IE 6/7 will not honour that
style for `select`, and Chrome will only do so when the `select` element
is clicked.

Further details:
http://tjvantoll.com/2012/07/10/default-browser-handling-of-the-css-text-transform-property/

Merge Normalize 2 and Normalize 1.

* <Q> remains as in Normalize 2 with quotes
* Add minify version