Added Bengali support

I am not sure about the `allDayHtml`. So left it as it is. If you can explain, then I will correct it too.

locale/bn.js

@@ -0,0 +1,11 @@
+$.fullCalendar.locale("bn", {
+	buttonText: {
+		month: "মাস",
+		week: "সপ্তাহ",
+		day: "দিন",
+		list: "লিস্ট"
+	},
+	allDayHtml: "Todo<br/>el día",
+	eventLimitText: "আরও দেখুন",
+	noEventsMessage: "কোন ইভেন্ট পাওয়া যায়নি"
+});