has
    algebra.has(set, props)
  
  Used to tell if the set contains the instance object props.
var algebra = new set.Algebra(
  new set.Translate("where","$where")
);
algebra.has(
  {"$where": {playerId: 5}},
  {id: 5, type: "3pt", playerId: 5, gameId: 7}
) //-> true
  
  Parameters
- set 
{Set}:A set.
 - props 
{Object}:An instance's raw data.
 
Returns
 {Boolean}: 
Returns true if props belongs in set and
false it not.