Support for nested collections

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All three of the following tests dealing with nested collections fail, even under 0.3.0.

NSString *RKURLEncodedStringFromDictionaryWithEncoding(NSDictionary *dictionary, NSStringEncoding encoding)
{
 return [CMDQueryStringSerialization queryStringWithDictionary:dictionary];
}

- (void)testShouldEncodeDictionaries
{
 NSDictionary *subDictionary = [NSDictionary dictionaryWithObject:@"value1" forKey:@"key1"];
 NSDictionary *dictionary = [NSDictionary dictionaryWithObject:subDictionary forKey:@"aDictionary"];
 NSString *expected = @"aDictionary[key1]=value1";
 NSString *actual = RKURLEncodedStringFromDictionaryWithEncoding(dictionary, NSUTF8StringEncoding);
 expect(actual).to.equal(expected);
}

- (void)testShouldEncodeArrayOfDictionaries
{
 NSDictionary *dictA = @{@"a": @"x", @"b": @"y"};
 NSDictionary *dictB = @{@"a": @"1", @"b": @"2"};

 NSArray *array = [NSArray arrayWithObjects:dictA, dictB, nil];
 NSDictionary *dictRoot = @{@"root" : array};

 NSString *expected = @"root[][a]=x&root[][b]=y&root[][a]=1&root[][b]=2";
 NSString *actual = RKURLEncodedStringFromDictionaryWithEncoding(dictRoot, NSUTF8StringEncoding);
 expect(actual).to.equal(expected);
}

- (void)testShouldEncodeRecursiveArrays
{
 NSArray *recursiveArray3 = [NSArray arrayWithObjects:@"item1", @"item2", nil];
 NSArray *recursiveArray2 = [NSArray arrayWithObject:recursiveArray3];
 NSArray *recursiveArray1 = [NSArray arrayWithObject:recursiveArray2];
 NSDictionary *dictionary = [NSDictionary dictionaryWithObject:recursiveArray1 forKey:@"recursiveArray"];
 NSString *expected = @"recursiveArray[][][]=item1&recursiveArray[][][]=item2";
 NSString *actual = RKURLEncodedStringFromDictionaryWithEncoding(dictionary, NSUTF8StringEncoding);
 expect(actual).to.equal(expected);
}

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@calebd feel free to close if you don't want to support this. RestKit is temporarily addressing this with RestKit/RestKit#1973.