Add reset button to calendar component that sets the date to empty.
Add reset button to calendar component that sets the date to empty.
Merge branch 'add_reset_button_to_calendar' of https://github.com/finnishtransportagency/digiroad2 into add_reset_button_to_calendar

Conflicts:
	UI/src/utils/date-utils.js
Merge pull request #100 from finnishtransportagency/add_reset_button_to_calendar

Add reset button to calendar