PhpUnit new namespace, ISBN-13 fix, bcmath being optional

fix more false positives against zero-only values in Luhn based valid…

…ators

GS1 GRAI fixed

New validators + fixes

- SSCN, UPC-A, EAn-8, GTIN-8, GTIN-12, GTIN-14 new GTIN / GS1 related validators
- ISIN validator
- phone numbers validator

2.0 is here, refactoring & making validators more static

Adding ISBN 10 & 13 validators

updated 1.1.4 tag

updated 1.1.3 tag

updated 1.1.2 tag

updated 1.1.1 tag