Remove all frameworks except Bootstrap (#251)

- Remove all frameworks except Bootstrap

- Remove roots-options.php and replace with a more simple
  roots-config.php

- Include all Bootstrap Javascript plugins by default in
  js/plugins.js

- Use Bootstrap Responsive and Topbar navigation by default

- Use Bootstrap markup on forms, page titles, image galleries,
  alerts and errors, post and comment navigation

- Remove Roots styles from style.css and introduce app.css for
  site-specific CSS. Remove almost all previous default Roots
  styles.

- Add latest updates from H5BP project

css/less/breadcrumbs.less

@@ -0,0 +1,22 @@
+// BREADCRUMBS
+// -----------
+
+.breadcrumb {
+  padding: 7px 14px;
+  margin: 0 0 @baseLineHeight;
+  #gradient > .vertical(@white, #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;
+  }
+}