updated to PySimpleSOAP-1.16

this fixes UnicodeEncodeError under py27 noticed via py-stdnum and
vatnumber (without py-suds) when checking VIES.

Changelog

Recent changes (2014/2015):

    Plug-in system to support for WSSE (Web-Services Security extensions)
    WSSE UsernameToken, UsernameDigestToken and BinaryTokenSignature support
    Pythonic XML Security Library basic implementation (canonicalization, SHA1 hashing and RSA signing / verification using X509 digital certificates)
    Improved SOAP Fault details
    Several fixes (basic python3 support, CDATA, )

Ongoing efforts:

    Unit Tests update & clean up (removing old tests, better framework, fixing non-deterministic results, etc.)
    WSDL advanced support (unifying nested elements structure dialects)
    Python3 support for WSSE XMLSec (M2Crypto alternatives?)
    Source code refactory to improve readability and maintainability

(richard)