add storage service for supporting amazon S3.

To support new file system like s3, I add storage service class and refactor file i/o functions.
update "delete storage file" process.
revised start/finish message of deleting files
Update test
change s3 bucket setting
sanitizing output text
Merge branch 'feature/aws-s3'
add setting for heroku.
remove JAVA_OPTS from Procfile
remove http.port setting
revise Procfile
add postgresql driver to build.sbt