New schema

[tweddielin]

Main changes are in the big-model-graph page, where now tyra pull up the top models from results.ranked_table (cache table) for each model_group_id aggregated by averaging over time. Also, the layout is changed with a dropdown model_comment menu.

• Change as_of_date with evaluation_start_time in query, but in react component, props are still asOfDate and setAsOfDate. They might be changed to evaluationDate and setEvaluationDate in later PR.
• Now the model-selectgraph component takes new endpoint get_model_groups(model_comment) as ajax call using the new query function get_model_groups().
• Implement couple data processing codes to fit the Highchart format by functional programming.
• The multiple parameter-metric selection is removed. We can only choose one parameter-metric at a time.
• Made some changes in main.css.

[tweddielin]

close issue #48

[tweddielin]

close issue #44

[tweddielin]

close #49