Updating Bootstrap to v.2.0.0

roots-actions.php:  added responsive css framework file
roots-options.php: changed default css classes for bootstrap v2.0.0
roots-scripts.php: updated less to v1.2.1, changed the load order and
added new scripts for bootstrap v2.0.0

Added all of the new css, js, less asset files and updated all of the
previous ones for bootstrap v2.0.0

css/bootstrap/lib/thumbnails.less

@@ -0,0 +1,35 @@
+// THUMBNAILS
+// ----------
+
+.thumbnails {
+  margin-left: -20px;
+  list-style: none;
+  .clearfix();
+}
+.thumbnails > li {
+  float: left;
+  margin: 0 0 @baseLineHeight 20px;
+}
+.thumbnail {
+  display: block;
+  padding: 4px;
+  line-height: 1;
+  border: 1px solid #ddd;
+  .border-radius(4px);
+  .box-shadow(0 1px 1px rgba(0,0,0,.075));
+}
+// Add a hover state for linked versions only
+a.thumbnail:hover {
+  border-color: @linkColor;
+  .box-shadow(0 1px 4px rgba(0,105,214,.25));
+}
+// Images and captions
+.thumbnail > img {
+  display: block;
+  max-width: 100%;
+  margin-left: auto;
+  margin-right: auto;
+}
+.thumbnail .caption {
+  padding: 9px;
+}