add date and slide number to default slide

I initialized from scratch a brand new presentation with our internal style.
I think that, as is intended for the progress line bar, it is better to see something you can delete instead not to see something you can add.

Tell me what you think.

Author: Valeria Zuccoli

template/onepunch.json

@@ -2,6 +2,6 @@
 	"width": 960,
 	"height": 600,
 	"progress": "line",
-	"date": "",
-	"slideNumber": false
+	"date": "October 21, 2015",
+	"slideNumber": true
 }