try to change DataMapper resource naming convention

[g8d3]

In models there is the line storage_names[:default] = 'patient', and so on, the idea is to see second title here, to create a rule that allows DataMapper to deduce table name from model class name, examples:

1. I create class Patient in file patient/patient.rb the deduced table name should be patient (by default is patients)
2. I create class Patient::Identifier in file patient/identifier.rb the deduced table name should be patient_identifier (by default is identifiers)