Merge branch 'cordawyn' into activemodelish
Add new types 'long', 'nonNegativeInteger', 'nonPositiveInteger,' 'negativeInteger', 'positiveInteger'

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Merge pull request #19 from PerfectMemory/new-xsd-types

New xsd types