Merge branch 'release/1.5.9' into develop
-. start 1.5.10-SNAPSHOT
-. add build status by drone.io
-. remove scala version
-. upgrade jedis version - 2.4.2
-. modify README.md
-. add travis ci
-. add travis build status
-. add travis build only develop
-. modify log level
[add] allow read properties from external file. ( request by @camaral1)
-. prepare release 1.5.10
Release 1.5.10