Broken round show bug

[Closes #57]

@killpack @sebastiangeiger @pdougall1 

I ended up going with a "dumb" approach. I removed the round/holes hasMany relationship, which I felt didn't really make sense, and instead just counted the number of turns for the first scorecard, which should always equal the number of holes. I then create a JS array from 1 to N.

I'm open to suggestions. My other thought was to go from round -> course -> holes, but didn't know how messy that might get when we start sideloading stuff.