Make closeOnSelect and month switch play nice together

[dbrack]

Fixes #91 and #97. #91 is already kind of fixed in master, but not when it's being used together with closeOnSelect.

I tested the following scenarios inside the storybook and they all work as documented:

<Calendar format="DD/MM/YYYY" date="01/01/2016" /> <Calendar disabled={true} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar disabled={false} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={false} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={true} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={true} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={true} disabled={true} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={true} disabled={false} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={false} disabled={false} format="DD/MM/YYYY" date="01/01/2016" /> <Calendar closeOnSelect={false} disabled={true} format="DD/MM/YYYY" date="01/01/2016" />

[Rudeg]

@dbrack Thanks!