Provide option to show solutions overview with the score

[rajgoel]

This PR addresses issue #2 and allows users to provide a solution overview with the score by adding

<div class="solutions">
    <div data-bind="foreach: { data: questions, as: 'question' }">
        <h3>
            Question <span data-bind="text: question.index"></span> (
            <span data-bind="css: {'text-success': question.correct }, visible: question.correct">Correct</span>
            <span data-bind="css: {'text-danger': !question.correct }, visible: !question.correct">Wrong</span>
            )
        </h3>
        <div data-bind="attr: {'id': 'solution-' + question.index}"></div>
    </div>
</div>

to the score section.