Date format of month view title should use standalone month format

[rzhukov]

For some languges month names is context sensitive. So for month+year title standalone month name should be used.
Instead of MMMM yyyy use LLLL yyyy in DateFormatTitleFormatter:

    public DateFormatTitleFormatter() {
        this.dateFormat = new SimpleDateFormat(
                "LLLL yyyy", Locale.getDefault()
        );
    }

[ekchang]

Fixed in 1.4.0