bumped version number and release date
Create target subdirs if they don't exist
escape harvest filepaths (option to create subdirs)

Escape filenames derived from OAI-PMH supplied identifiers, unless
the user specifies creation of sub-directories  the
`--create-subdirs` option.
Escape identifier based filepath, or create subdirs

Closes #5

Merge branch 'hotfix/1.1.3'