added ipfs cluster support

.gitignore

...java/eu/fairkom/faircommons/ipfs_service/api/IpfsApi.java

...commons/ipfs_service/config/IpfsServiceConfiguration.java

.../faircommons/ipfs_service/service/IpfsClusterService.java

...m/faircommons/ipfs_service/service/IpfsDaemonService.java

...fairkom/faircommons/ipfs_service/service/IpfsService.java

...mmons/ipfs_service/service/IpfsServiceMessageHandler.java

.../fairkom/faircommons/ipfs_service/models/IpfsAddView.java

...-services/ipfs-service/src/main/resources/application.yml

faircommons-services/pom.xml