Renamed normalize.css to normalize.scss.
Remove height from `audio:not([controls])` in iOS5

A bug in iOS5 means that `audio` elements without controls are not
entirely hidden. They retain some height, as demonstrated in this test
case: http://jsbin.com/ios-audio-bug/3

The fix is to add `height: 0` to the rule.

Fix #69
Renamed normalize.css to normalize.scss.
Convert CSS comments to Sass comments.
Convert CSS comments to Sass comments.
Use box-sizing mixin in place of box-sizing property.
Merge branch 'rebase-on-master' into normalize-with-sass
Add placeholder color normalization

The browser-defined style for placeholder text color is overwritten by style for input elements in Firefox. Adding :-moz-placeholder style overrides that, bringing Firefox inline with other browsers.

@mathiasbynens made a test case for this @ https://tinker.io/be2f2

This change improves consistency of placeholder style between Chrome, Safari, and Firefox browsers.
Add placeholder color normalization

As @mathiasbynens points out, webkit has already set the placeholder, and it has set it as darkGray (#A9A9A9)
Correct code format and update timestamp
Addresses placeholder text remaining visible on focus in Chrome

The placeholder attribute in Chrome does not work to spec. This makes the text transparent on focus to work like Firefox, Safari, and the spec. Credit goes to @chadbaudoin for bringing this up in his pull request https://github.com/necolas/normalize.css/pull/86 and this Chrome bug is further documented at http://code.google.com/p/chromium/issues/detail?id=106714  and my own test is at https://tinker.io/be2f2/1
Fix indentation and update timestamp

Correct the indentation for the WebKit placeholder focus rule and move
the placeholder rules to the bottom of the forms normalization.

Update the timestamp.
Revert addition of input placeholder rules

This commit reverts the following 5 commits:

49392e9df27b7036609f56861679e8cf9c0ea264
f9572a461a6a3baf7f151c095ab23babc4937a39
79e2c16ba5157c46ea4a129dd99420ac2f85f3f0
2691e7ab14682dc8f9e942456887df0e35804087
567af2e7d68d2bebb6428748190fd7dc5e6a4e51

The `:moz-placeholder` rule doesn't have the desired effect because any
subsequent rule with higher specificity will result in the Firefox bug
resurfacing. There is no way to ensure that Firefox doesn't change the
color of the placeholder text. Example: https://tinker.io/e34a2

The `:focus::webkit-input-placeholder` normalization is being removed
because the current Chrome / Safari on Lion OSX behaviour is allowed in
the spec, Firefox is set to implement the same behaviour, and other
browsers may follow suit for usability reasons.

Some browser differences like these - low importance and in flux - can
be allowed to evolve and settle before assessing whether or not they
need or merit normalization.
Renamed normalize.css to normalize.scss.
Convert CSS comments to Sass comments.
Merge branch 'rebase-on-master' into normalize-with-sass
Merge brnach 'normalize-with-sass' into normalize-with-compass
Merge branch 'normalize-with-sass' into normalize-with-compass
Add missing @import for box-sizing mixin.
Add $base-font-family variable.