Extract exercise settings to own object for json output. Consider also change for db schema.

[jamo]

The Exercise-objects embedded in the Courses-objects provided by http://tmc.mooc.fi/hy/courses/37.json?api_version=7 are getting pretty large. Would it be possible to embed a further object of some kind in them to hold all these settings? I'm thinking something like this to provide more structure:

{
    "id": 2968,
    "name": "WK1-W1E00.Hiekkalaatikko",
    "locked": false,
    "deadline_description": "2014-09-14 18:00:00 +0300",
    "deadline": "2014-09-14T18:00:00+03:00",
    "checksum": "cd5e2e409e605b535d7eea2bd72231b8",
    "return_url": "http://tmc.mooc.fi/hy/exercises/2968/submissions.json",
    "zip_url": "http://tmc.mooc.fi/hy/exercises/2968.zip",
    "returnable": true,
    "requires_review": false,
    "attempted": false,
    "completed": false,
    "reviewed": false,
    "all_review_points_given": true,
    "settings": {
        "allow_code_reviews": true,
        "allow_feedback": true,
        "allow_return_expired": false,
        "memory_limit": null,
        "runtime_params": [],
        "valgrind_strategy": "fail"
    },
    "solution_zip_url": "http://tmc.mooc.fi/hy/exercises/2968/solution.zip",
    "exercise_submissions_url": "http://tmc.mooc.fi/hy/exercises/2968.json?api_version=7"
}

Thanks to @ljleppan for the idea!