Initial commit for _sass.

Props @michaelArestad @hugobeta, and @jacklenox.

* Give prefix to variable files. This avoids confusion with files of similar names like typography. It also helps with the visual recognition over what file does what.
* Set up mixins-master.
* Setting foundation for encouraging in larger projects use of more than one mixing file. This creates a master mixins file that we can then bring subs into if the project grows.
* Fixed line breaks, spacing and new lines. Props @gregrickaby.
* Nest widget select. Props @gregrickaby.
* Make variables be variables-site. Makes this the global variables folder. People can then use sub folders in sections for local only variables.
* Change content directory to be site directory.
* Remove zip. Revert `style.css` to not be auto generated version.
* Fixes rem size issue on body font.
* Fixes for differences between `_s` and `_sass`. Fixed font sizes, added in display block to classes so they compile and the theme check
passes.
* Remove text domain and clean up css.

sass/_reset.scss

@@ -0,0 +1,72 @@
+html, body, div, span, applet, object, iframe,
+h1, h2, h3, h4, h5, h6, p, blockquote, pre,
+a, abbr, acronym, address, big, cite, code,
+del, dfn, em, font, ins, kbd, q, s, samp,
+small, strike, strong, sub, sup, tt, var,
+dl, dt, dd, ol, ul, li,
+fieldset, form, label, legend,
+table, caption, tbody, tfoot, thead, tr, th, td {
+	border: 0;
+	font-family: inherit;
+	font-size: 100%;
+	font-style: inherit;
+	font-weight: inherit;
+	margin: 0;
+	outline: 0;
+	padding: 0;
+	vertical-align: baseline;
+}
+html {
+	font-size: 62.5%; /* Corrects text resizing oddly in IE6/7 when body font-size is set using em units http://clagnut.com/blog/348/#c790 */
+	overflow-y: scroll; /* Keeps page centered in all browsers regardless of content height */
+	-webkit-text-size-adjust: 100%; /* Prevents iOS text size adjust after orientation change, without disabling user zoom */
+	-ms-text-size-adjust:     100%; /* www.456bereastreet.com/archive/201012/controlling_text_size_in_safari_for_ios_without_disabling_user_zoom/ */
+}
+*,
+*:before,
+*:after { /* apply a natural box layout model to all elements; see http://www.paulirish.com/2012/box-sizing-border-box-ftw/ */
+	@include box-sizing(border-box);
+}
+body {
+	background: $color__background-body; /* Fallback for when there is no custom background color defined. */
+}
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+main,
+nav,
+section {
+	display: block;
+}
+ol, ul {
+	list-style: none;
+}
+table { /* tables still need 'cellspacing="0"' in the markup */
+	border-collapse: separate;
+	border-spacing: 0;
+}
+caption, th, td {
+	font-weight: normal;
+	text-align: left;
+}
+blockquote:before, blockquote:after,
+q:before, q:after {
+	content: "";
+}
+blockquote, q {
+	quotes: "" "";
+}
+a:focus {
+	outline: thin dotted;
+}
+a:hover,
+a:active {
+	outline: 0;
+}
+a img {
+	border: 0;
+}