Use min_score and max_score from DB for judge scoring dropdowns

[i077]

Right now on the judge-score branch, when we open the judge scoring form, it looks like this:

The score input boxes are set to take any number, but we don't want judges to enter just any arbitrary number. In the database, we have a table called ScoringCategory that actually declares the lower and upper bounds for each of the categories:

We need to change the <input> elements for each of the categories to be dropdowns with numbers ranging from the category's min_score to its max_score.

[rdoughty10]

created pull request for this issue