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/button-groups.less

@@ -0,0 +1,147 @@
+// BUTTON GROUPS
+// -------------
+
+
+// Make the div behave like a button
+.btn-group {
+  position: relative;
+  .clearfix(); // clears the floated buttons
+  .ie7-restore-left-whitespace();
+}
+
+// Space out series of button groups
+.btn-group + .btn-group {
+  margin-left: 5px;
+}
+
+// Optional: Group multiple button groups together for a toolbar
+.btn-toolbar {
+  margin-top: @baseLineHeight / 2;
+  margin-bottom: @baseLineHeight / 2;
+  .btn-group {
+    display: inline-block;
+    .ie7-inline-block();
+  }
+}
+
+// Float them, remove border radius, then re-add to first and last elements
+.btn-group .btn {
+  position: relative;
+  float: left;
+  margin-left: -1px;
+  .border-radius(0);
+}
+// Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
+.btn-group .btn:first-child {
+  margin-left: 0;
+     -webkit-border-top-left-radius: 4px;
+         -moz-border-radius-topleft: 4px;
+             border-top-left-radius: 4px;
+  -webkit-border-bottom-left-radius: 4px;
+      -moz-border-radius-bottomleft: 4px;
+          border-bottom-left-radius: 4px;
+}
+.btn-group .btn:last-child,
+.btn-group .dropdown-toggle {
+     -webkit-border-top-right-radius: 4px;
+         -moz-border-radius-topright: 4px;
+             border-top-right-radius: 4px;
+  -webkit-border-bottom-right-radius: 4px;
+      -moz-border-radius-bottomright: 4px;
+          border-bottom-right-radius: 4px;
+}
+// Reset corners for large buttons
+.btn-group .btn.large:first-child {
+  margin-left: 0;
+     -webkit-border-top-left-radius: 6px;
+         -moz-border-radius-topleft: 6px;
+             border-top-left-radius: 6px;
+  -webkit-border-bottom-left-radius: 6px;
+      -moz-border-radius-bottomleft: 6px;
+          border-bottom-left-radius: 6px;
+}
+.btn-group .btn.large:last-child,
+.btn-group .large.dropdown-toggle {
+     -webkit-border-top-right-radius: 6px;
+         -moz-border-radius-topright: 6px;
+             border-top-right-radius: 6px;
+  -webkit-border-bottom-right-radius: 6px;
+      -moz-border-radius-bottomright: 6px;
+          border-bottom-right-radius: 6px;
+}
+
+// On hover/focus/active, bring the proper btn to front
+.btn-group .btn:hover,
+.btn-group .btn:focus,
+.btn-group .btn:active,
+.btn-group .btn.active {
+  z-index: 2;
+}
+
+// On active and open, don't show outline
+.btn-group .dropdown-toggle:active,
+.btn-group.open .dropdown-toggle {
+  outline: 0;
+}
+
+
+
+// Split button dropdowns
+// ----------------------
+
+// Give the line between buttons some depth
+.btn-group .dropdown-toggle {
+  padding-left: 8px;
+  padding-right: 8px;
+  @shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
+  .box-shadow(@shadow);
+  *padding-top: 5px;
+  *padding-bottom: 5px;
+}
+
+.btn-group.open {
+  // IE7's z-index only goes to the nearest positioned ancestor, which would
+  // make the menu appear below buttons that appeared later on the page
+  *z-index: @zindexDropdown;
+
+  // Reposition menu on open and round all corners
+  .dropdown-menu {
+    display: block;
+    margin-top: 1px;
+    .border-radius(5px);
+  }
+
+  .dropdown-toggle {
+    background-image: none;
+    @shadow: inset 0 1px 6px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
+    .box-shadow(@shadow);
+  }
+}
+
+// Reposition the caret
+.btn .caret {
+  margin-top: 7px;
+  margin-left: 0;
+}
+.btn:hover .caret,
+.open.btn-group .caret {
+  .opacity(100);
+}
+
+
+// Account for other colors
+.btn-primary,
+.btn-danger,
+.btn-info,
+.btn-success {
+  .caret {
+    border-top-color: @white;
+    .opacity(75);
+  }
+}
+
+// Small button dropdowns
+.btn-small .caret {
+  margin-top: 4px;
+}
+