1. 빌드설정수정
Merge branch 'master' of https://github.com/fastcatsearch/fastcatsearch-ir.git
Merge branch 'master' of https://github.com/fastcatsearch/fastcatsearch-ir.git
..
Merge branch 'master' of https://github.com/fastcatsearch/fastcatsearch-ir.git
Merge branch 'master' of https://github.com/fastcatsearch/fastcatsearch-ir.git
1. add method isAlphabetic for compiler compatibility