[IMP] all: new design to match the one on odoo.com

* upgrade to bootstrap 3.3.6

* new Header, port website LESS
  - Add the new header
  - Modify sub-header in order to handle “back” button and version
    switcher
  - Port website’s Less:
    * Use same variables’ names
    * Review fonts and colours in order to fit the new style

* add new footer

* Review and optimise JS code in order properly handle the new header,
  footer and card.top animations

* replace  banner images

_extensions/odoo/static/bootstrap-3.3.6/less/pager.less

@@ -0,0 +1,54 @@
+//
+// Pager pagination
+// --------------------------------------------------
+
+
+.pager {
+  padding-left: 0;
+  margin: @line-height-computed 0;
+  list-style: none;
+  text-align: center;
+  &:extend(.clearfix all);
+  li {
+    display: inline;
+    > a,
+    > span {
+      display: inline-block;
+      padding: 5px 14px;
+      background-color: @pager-bg;
+      border: 1px solid @pager-border;
+      border-radius: @pager-border-radius;
+    }
+
+    > a:hover,
+    > a:focus {
+      text-decoration: none;
+      background-color: @pager-hover-bg;
+    }
+  }
+
+  .next {
+    > a,
+    > span {
+      float: right;
+    }
+  }
+
+  .previous {
+    > a,
+    > span {
+      float: left;
+    }
+  }
+
+  .disabled {
+    > a,
+    > a:hover,
+    > a:focus,
+    > span {
+      color: @pager-disabled-color;
+      background-color: @pager-bg;
+      cursor: @cursor-disabled;
+    }
+  }
+}