Store hazard thresholds in database and add endpoint to return it

[longshuicy]

right now it's hardcoded. e.g.

  public final static JSONObject HURRICANE_THRESHOLDS = new JSONObject("{ " +
        "'waveHeight': {'value': 0.3, 'unit': 'm'}," +
        "'surgeLevel': {'value': 0.3, 'unit': 'm'}," +
        "'inundationDuration': {'value': 1, 'unit': 'hr'}," +
        "'inundationDepth': {'value': 0.3, 'unit': 'm'}," +
        "'wavePeriod': {'value': 3, 'unit': 's'}," +
        "'waveDirection': {'value': null, 'unit': 'deg'}," +
        "'waterVelocity': {'value': 0.5, 'unit': 'm/s'}," +
        "'windVelocity': {'value': 0.5, 'unit': 'm/s'}," +
        "}");

It would be nice to store in the database and return to the client so local hazards can leverage this to set threshold as well.