Create the evaluations rating API

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Create the evaluations rating API

• Should be able to given an evaluation ID, be able to get the current ratings, as well as be able to PUT? the users updated ratings.

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Assumptions:

• groups_users records with a user of role 'evaluator' are assignments. Thus assignments can be identified by the groups_users id field.
• when an evaluation is requested (GET message), it look in the database for the evaluator_groups_user_id field (see also groups_users id field), and either return a new blank record, or the record found in the database.
• when an evaluation is being entered, it will receive a PUT message, to either create a new record, or entirely replace the record, depending upon if the record exists already.
• constants: year_id = 1, semester = '1', school_id = 1, grade = '1', group_id = 1, evaluator_user_id = 1.