Add properties file to allow for settings

[atla5]

name	type	description
exportFilename	String	name given to all filenames (e.g. collection_name.csv, collection_name.json)
createAuthorityRecord	boolean	create a record containing the authority control information
createCollectionRecord	boolean	create a record for the collection metadata
includeTextFile	boolean	include the metadata text files as filenames
...	...	...