fact: Add the counter back to facts.

Since we're now already consuming the generator and creating a list we
can call lenght on it just fine.

Closes #18

puppetboard/templates/fact.html

@@ -1,7 +1,7 @@
 {% extends 'layout.html' %}
 {% import '_macros.html' as macros %}
 {% block content %}
-<h1>{{name}}{% if value %}/{{value}}{% endif %}</h1>
+<h1>{{name}}{% if value %}/{{value}}{% endif %} ({{facts|length}})</h1>
 {{macros.facts_graph(facts, autofocus=True, show_node=True, margin_bottom=10)}}
 {{macros.facts_graph_value(facts, autofocus=True, show_node=True, margin_bottom=10)}}
 {% if value %}