feat(java/S3Uploads.java): Widen/fine-uploader#898 - modify server-side example to handle signatures for REST calls
feat(java/S3Uploads.java): Widen/fine-uploader#898 - modify server-side example to handle signatures for REST calls

FineUploader/server-examples,FineUploader/server-examples,paul-herrmann/server-examples,paul-herrmann/server-examples,FineUploader/server-examples,paul-herrmann/server-examples,paul-herrmann/server-examples,paul-herrmann/server-examples,FineUploader/server-examples,FineUploader/server-examples,paul-herrmann/server-examples,FineUploader/server-examples,paul-herrmann/server-examples,FineUploader/server-examples,paul-herrmann/server-examples,FineUploader/server-examples