add navbarheight support to .brand and .nav links in navbar

less/navbar.less

@@ -16,6 +16,7 @@
 
 // Gradient is applied to it's own element because overflow visible is not honored by IE when filter is present
 .navbar-inner {
+  height: @navbarHeight;
   padding-left:  20px;
   padding-right: 20px;
   #gradient > .vertical(@navbarBackgroundHighlight, @navbarBackground);
@@ -69,7 +70,10 @@
   .brand {
     float: left;
     display: block;
-    padding: 8px 20px 12px;
+    // Vertically center the text given @navbarHeight
+    @elementHeight: 20px;
+    padding: ((@navbarHeight - @elementHeight) / 2 - 2) 20px ((@navbarHeight - @elementHeight) / 2 + 2);
+
     margin-left: -20px; // negative indent to left-align the text down the page
     font-size: 20px;
     font-weight: 200;
@@ -225,7 +229,9 @@
 // Links
 .navbar .nav > li > a {
   float: none;
-  padding: 10px 10px 11px;
+  // Vertically center the text given @navbarHeight
+  @elementHeight: 20px;
+  padding: ((@navbarHeight - @elementHeight) / 2 - 1) 10px ((@navbarHeight - @elementHeight) / 2 + 1);
   line-height: 19px;
   color: @navbarLinkColor;
   text-decoration: none;