Update IMLs.
Allow ExtendedData objects to be instantiated from existing JSON. Update tests.
Update CommerceExtendedData to separate out Items into a, inner class. Update tests.
Add json constructor for CommerceExtendedData.Item.
Add CommerceExtendedData.Item default constructor.
Add setters for CommerceExtendedData.Item.
Update IDEA IML files.
Prepare for 1.6.5-SNAPSHOT release. Update versions and changelog.
Bump to 1.6.5
Update IML.