Create new round form with a single field

And move round index template into its own... template.

[#21]
Add players dropdown field to new round page

[#21]
Add remove player button

[#21]
Show current user on list of players on round form

[#21]
Save a round

[#21]
Add required attribute to course

[#21]
Merge pull request #71 from gschorkopf/killpack/new_rounds

Killpack/new rounds