Optionally show dates from previous and next month in table

[gel1os]

Hello, thank you for a great component, it works really well.

I have a suggestion to add possibility to optionally show days from other months in calendar, so there are no empty cells in table.

Thanks!

[motss]

@gel1os First of all, huge thanks for the support. This is one great feature to have in the datepicker but this is unfortunately not part of the specs of a Material Design 2 based datepicker. This might change in v5 which follows the latest specs.