Replace context binding to a variable with built in function

gistfile1.js

Person.prototype.save = function() {
    var person = this;
     person.database.insert(person.properties, function(err, result) {
         person.properties = result;
     });
};

// becomes:

Person.prototype.save = function() {
     person.database.insert(person.properties, $.proxy(function(err, result) {
         this.properties = result;
     }, this));
};

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