changed BulkImportOptions and Constants classes -- refactoring
changed BulkImportOptions and Constants classes -- added new constants in the classes
changed UploadConfiguration class -- added new option '--auto-create-session' and '--auto-delete-session' and refactored it
updated td-bulk-import.jar
minor change of {Prepare,Upload}Configuration classes
minor change of UploadConfiguration class -- deleted unused import statements
changed UploadConfiguration class -- deleted comments from the class