* Migrated ur an sqlite database
* Removed unnecessary IOExceptions
* Removed an util class not needed anymore
* Updated README.md and docker-compose.yml to reflect new storage mechanism
* This change was not meant for this branch
* Port change with environment variable
* Unused imports
* Updated README.md
* Added basic protection against duplication
Some platforms has some problems with file locking, so I was forced to use an alternative. SQLite seems be the best option currently available
* Migrated to an sqlite database
* Removed unnecessary IOExceptions
* Removed an util class not needed anymore
* Updated README.md and docker-compose.yml to reflect new storage mechanism