Bootstrap Center Navbar Items

To extend upon the selected answer, adding vertical align top will prevent the space from appearing under the nav items.

.navbar.center .navbar-inner {
    text-align: center;
}

.navbar.center .navbar-inner .nav {
    display:inline-block;
    float: none;
    vertical-align: top;
}

Demo

You will need to modify some CSS rules for Navbar component. So add a class center to nav.navbar and the following rules:

.navbar.center .navbar-inner {
    text-align: center;
}

.navbar.center .navbar-inner .nav {
    display:inline-block;
    float: none;
}

Working demo (Bootstrap 3.3.7)