Log Message:
py-stdnum: updated to 1.8

changes from 1.7 to 1.8
* add modules for the following number formats:
 - NCF (Números de Comprobante Fiscal, Dominican Republic receipt number)
 - Euro banknote serial numbers
 - CAS RN (Chemical Abstracts Service Registry Number)
 - Aadhaar (Indian digital resident personal identity number)
   (thanks Srikanth Lakshmanan)
 - PAN (Permanent Account Number, Indian income tax identifier)
   (thanks Srikanth Lakshmanan)
* add functions for using the Dominican Republic DGII web service to validate
  and search for RNC and NCF numbers
* add/update whitelists for Dominican Republic RNC and Cedula
* support zeep as preferred SOAP library (suds and pysimplesoap are tried
  as fallback)
* rename stdnum.iso9362 to stdnum.bic (iso9362 is deprecated but still
  available for compatibility)
* add tests for web services (not normally run to avoid unnecessary load)
* fixes and improvement to the sample online validation service