Revising product to use String for product code, create validator.
Correct English and meaning in README
Add ProductValidator for product codes. Added test code including test/
source tree and hsqldb for testing.
add more ignores
Update local classpath
Change product code to String, add test class. But EANService is wrong
url.
Merge branch 'origin/productcode-is-string'

Conflicts:
	src/META-INF/persistence.xml
	src/pis/entity/Product.java
	src/pis/resource/ProductResource.java
	src/pis/server/EANData.java
	src/pis/server/ProductService.java
	src/pis/server/ProductServiceManager.java
	src/pis/service/ProductDao.java
merge branches