First try to get new types support in ogm.

Began with URLType but was stoped by lack of support of unwraping URL from URL in org.hibernate.type.descriptor.java.UrlTypeDescriptor (first trying to bind type in ISPN as native java object).

Coded an URLTypeDescriptor on l behalf (extend hibernate code one)

Working BigDecimal, BigInteger, Boolean, Byte, Url as java native types.

Shall move to string representation before going on on other types.