Better user-experience on date pickers

Added pre set dates to all date pickers on Startday for a better and smoother user-experience.

When opening a date picker, in most cases it seems people choose the same options: 1 week back, 1 month back etc. So adding pre defined dates to easy pick hopefully will help the users overall experience of the product.

https://startdayblog.s3-eu-west-1.amazonaws.com/startday_date_selector.png