Merge branch 'release/1.5.10' into develop
-. start 1.5.11-SNAPSHOT
-. modify enumeration property test code
-. upgrade hibernate library, fst
upgrade library
-. DataSource 를 HikariCP 로 변경.
-. change build tool ( migrate to gradle )
-. Gradle 로 QueryDSL 관련 코드 생성 및 테스트 완료.
-. plugin 중에 idea 와 scala 가 충돌나는 버그 테스트
set ignored, change travis to use gradle
-. upgrade mysql-connector-java
-. change cache destroy strategy.
    when SessionFactory destroyed, delete all cache region -> leave cache region.
    but, when retrive cache item, check cache item expiration.
-. upgrade hikari cp 1.4.0
-. jedis version upgrade to 2.5.1
prepare 1.5.11
prepare release 1.5.11
Merge branch 'release/1.5.11'
Merge branch 'release/1.5.11' into develop
-. change gradle to maven
-. prepare release 1.6.0