Added date picker to enter result page.

1. There was a bug where the user input for start_time was sent directly as a value to the database. This made for a miserable user experience since they'd have to guess a correct format. Additionally, the view wasn't in a transaction block, so elos would change without a game being added.
2. Added thinking through a permenant solution to the task board.
3. Added a datepicker to make adding dates more friendly.
4. Added a default of using the present time when the time format couldn't be converted from the datepicker's format.