Ek - Add Comment and time to match request

* A user can comment on a match request
* A user can add a date and time to match request
* A user can add a date and time with a date time picker
* Add Guest user (will be used for authorizations)
* A user can edit and delete a comment
I'm a big fan of the a more descriptive name here, such as `match_at` 

https://github.com/thoughtbot/guides/tree/master/style#rails