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/component-animations.less

@@ -0,0 +1,18 @@
+// COMPONENT ANIMATIONS
+// --------------------
+
+.fade {
+  .transition(opacity .15s linear);
+  opacity: 0;
+  &.in {
+    opacity: 1;
+  }
+}
+
+.collapse {
+  .transition(height .35s ease);
+  position:relative;
+  overflow:hidden;
+  height: 0;
+  &.in { height: auto; }
+}