change for immutable class
cursor refactoring
cursor관련 테스트 삭제
filter 구현
encoding 추가
filter type 변경 : NSString -> NSArray
Query filter would be deprecated.
Merge branch 'feature/RefactoringMethod' of https://github.com/baasio/baas.io-sdk-ios into feature/RefactoringMethod
Merge remote-tracking branch 'origin/feature/RefactoringMethod' into develop