restrict dashboard to stable Perls

We need to fix the list of stable/devel Perls in the database, but we
should still be doing this

Refs #10

share/public/chart.html

@@ -146,7 +146,7 @@ <h2 id="summary">{{version}}</h2>
                 "?dist=" + this.dist + "&version=" + this.version
             );
 
-            $.getJSON( 'http://api.cpantesters.org/v3/summary/' + this.dist + '/' + this.version, function (data ) {
+            $.getJSON( 'http://api.cpantesters.org/v3/summary/' + this.dist + '/' + this.version + '?perl_maturity=stable', function (data ) {
                 self.fetchingSummary = false;
                 self.summary = data;