HTTP Content-Type is "application/soap+xml"

According to http://www.w3.org/TR/2007/REC-soap12-part0-20070427/#L26866
Security bug fix: replace predictable nonce with random
Support HTTP status codes != 500 for a fault

According to http://www.ws-i.org/Profiles/BasicProfile-1.0-2004-04-16.html#refinement16485352 and
http://www.ws-i.org/Profiles/BasicProfile-1.0-2004-04-16.html#refinement16488480
5xx and 4xx may be used for faults
Fix xs:any support
makefile: make buildroot configurable.

git-svn-id: http://svn.fedorahosted.org/svn/suds/trunk@712 0b8c961e-115e-4cb0-8d11-a7d6dae58e8c
Don't add prefix (None) to the prefixes dict.

git-svn-id: http://svn.fedorahosted.org/svn/suds/trunk@710 0b8c961e-115e-4cb0-8d11-a7d6dae58e8c
Clear expns when setting a prefix.

git-svn-id: http://svn.fedorahosted.org/svn/suds/trunk@709 0b8c961e-115e-4cb0-8d11-a7d6dae58e8c