start breaking down patterns.less into more distinct files, update docs for forms to use correct classes

lib/breadcrumbs.less

@@ -0,0 +1,22 @@
+// BREADCRUMBS
+// -----------
+
+.breadcrumb {
+  margin: 0 0 @baseLineHeight;
+  padding: 7px 14px;
+  #gradient > .vertical(#ffffff, #f5f5f5);
+  border: 1px solid #ddd;
+  .border-radius(3px);
+  .box-shadow(inset 0 1px 0 @white);
+  li {
+    display: inline;
+    text-shadow: 0 1px 0 @white;
+  }
+  .divider {
+    padding: 0 5px;
+    color: @grayLight;
+  }
+  .active a {
+    color: @grayDark;
+  }
+}