tons of docs cleanup in css, adding subnav to official components

less/variables.less

@@ -168,6 +168,16 @@
 @navbarBrandColor:                @navbarLinkColor;
 
 
+// Subnav
+// -------------------------
+@subnavHeight:                    36px;
+@subnavBackground:                #eeeeee;
+@subnavBackgroundHighlight:       #f5f5f5;
+
+@subnavBorder:                    #e5e5e5;
+@subnavBorderRadius:              4px;
+
+
 // Hero unit
 // -------------------------
 @heroUnitBackground:              @grayLighter;