Checkin/Raffle Improvement

- Made it so organizer are not "checkin-able"
- Added extra confirm step so people don't checkin other people (are you sure "name"?)
- Added a placeholder image for blank avatars
Raffle Improv.

- Made raffle process drop from 15s to 8s
- Adjusted CSS to show the name which had been hidden
Name fix

- Gave the name block more space for bigger names
Merge pull request #16 from AmsterdamPHP/improve-checkin

Improve checkin