Migrate navbar icon to font-awesome. Closes #34.

biscuit/core/templates/core/base.html

@@ -24,7 +24,7 @@
      {% fa 'fa-align-justify' %}
     </button>
     <a class="navbar-brand" href="{% url "index" %}">
-     <span class="glyphicon glyphicon-briefcase"></span> BiscuIT School Information System
+     {% fa 'fa-briefcase' %} BiscuIT School Information System
     </a>
 
    <div class="collapse navbar-collapse" id="navbar-main">