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/typography/_copy.scss

@@ -0,0 +1,70 @@
+p {
+	margin-bottom: 1.5em;
+}
+
+b, strong {
+	font-weight: bold;
+}
+
+dfn, cite, em, i {
+	font-style: italic;
+}
+
+blockquote {
+	margin: 0 1.5em;
+}
+
+address {
+	margin: 0 0 1.5em;
+}
+
+pre {
+	background: $color__background-pre;
+	font-family: $font__pre;
+	@include font-size(1.5);
+	line-height: $font__line-height-pre;
+	margin-bottom: 1.6em;
+	max-width: 100%;
+	overflow: auto;
+	padding: 1.6em;
+}
+
+code, kbd, tt, var {
+	@include font-size(1.5);
+	font-family: $font__code;
+}
+
+abbr, acronym {
+	border-bottom: 1px dotted $color__border-abbr;
+	cursor: help;
+}
+
+mark, ins {
+	background: $color__background-ins;
+	text-decoration: none;
+}
+
+sup,
+sub {
+	font-size: 75%;
+	height: 0;
+	line-height: 0;
+	position: relative;
+	vertical-align: baseline;
+}
+
+sup {
+	bottom: 1ex;
+}
+
+sub {
+	top: .5ex;
+}
+
+small {
+	font-size: 75%;
+}
+
+big {
+	font-size: 125%;
+}

sass/typography/_headers.scss

@@ -0,0 +1,3 @@
+h1, h2, h3, h4, h5, h6 {
+	clear: both;
+}

sass/typography/_typography.scss

@@ -0,0 +1,14 @@
+body,
+button,
+input,
+select,
+textarea {
+	color: $color__text-main;
+	font-family: $font__main;
+	@include font-size(1.6);
+	line-height: $font__line-height-body;
+}
+
+@import "headers";
+
+@import "copy";