Added
* `version` module with
* `version.get_versions()` returning an OrderedDict of library:version inclusing libzim
* `version.print_versions()` print it on stdout (or another fd)
* `version.get_libzim_version()` returns the libzim version only
Changed
* `Creator.add_metadata` no longer transforms (~pascalize) name (161)
Removed
* `writer.pascalize` function