Validate instance against schema on save

This replaces the throwing of errors when assigning values to root level
schema properties and means that child elements are now validated when
saving.

NOTE: This still doesn't validate for custom save commands { $set: {} } etc.

lib/Instance.js

@@ -126,6 +126,9 @@ Instance.prototype.save = function(conditions, changes, callback) {
 	}
 
 	if(!changes) {
+		var validation = validate(schema, this.__state.modified, undefined, this.__state.model.extraValidators);
+		if(!validation.passed) return callback(validation.toError());
+
 		var original = _.cloneDeep(this.__state.original);
 		var modified = _.cloneDeep(this.__state.modified);
 
@@ -232,9 +235,7 @@ Instance.prototype.__extendSchema = function() {
 					},
 					set: function(value) {
 						/// <value type="Object">Set the value of this field. Changes may be committed by calling save() on this instance.</value>
-						var validation = validate(schema[targetProperty], value, targetProperty, this.__state.model.extraValidators);
-						if (!validation.passed) throw validation.toError();
-							$.__state.modified[targetProperty] = value;
+						$.__state.modified[targetProperty] = value;
 					},
 					enumerable: true
 				});
@@ -269,8 +270,6 @@ Instance.forModel = function(model) {
 				return this.__state.modified[name] === undefined ? null : this.__state.modified[name];
 			},
 			set: function(value) {
-				var validation = validate(validator, value, name, model.extraValidators);
-				if(!validation.passed) throw validation.toError();
 				this.__state.modified[name] = value;
 			},
 			enumerable: true