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/pager.less

@@ -0,0 +1,30 @@
+// PAGER
+// -----
+
+.pager {
+  margin-left: 0;
+  margin-bottom: @baseLineHeight;
+  list-style: none;
+  text-align: center;
+  .clearfix();
+}
+.pager li {
+  display: inline;
+}
+.pager a {
+  display: inline-block;
+  padding: 5px 14px;
+  background-color: #fff;
+  border: 1px solid #ddd;
+  .border-radius(15px);
+}
+.pager a:hover {
+  text-decoration: none;
+  background-color: #f5f5f5;
+}
+.pager .next a {
+  float: right;
+}
+.pager .previous a {
+  float: left;
+}