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* Add modules for the following number formats:
- ISMN (International Standard Music Number)
- ISAN (International Standard Audiovisual Number)
- IMEI (International Mobile Equipment Identity)
- MEID (Mobile Equipment Identifier)
- GRid (Global Release Identifier)
* Add modules for handling the following check digit algorithms:
- the Verhoeff algorithm
- the Luhn and Luhn mod N algorithms
- some algorithms described in ISO/IEC 7064: Mod 11, 2, Mod 37, 2,
Mod 97, 10, Mod 11, 10 and Mod 37, 36
* Added more unit tests