Small bugs on DatePicker

[kaiwenni]

Hi, we are using the react-datepicker library in our company and are very happy with it. There are two things that need improvement to make it the perfect library for us.

1. When the picker has the properties showQuarterYearPicker and selectsMultiple at the same time, it doesn't work as expected. I can use it fine but when selecting a quarter, the class ...--selected does not get added so you can't see on the datepicker that the quarter has been selected. (screenshot 1)
2. When showing more than one month in the datepicker, the overflowing days in between the months are selectable but the number of day is not shown (screenshot 2).

It would be great if you could provide me with some solutions for these two cases.