fixed: "NameError: uninitialized constant SOAP::HTTPStreamHandler::Versi...

...on" error

In 09981ab (extract version, 2013-12-26) SOAP::Version was replaced by
Soap::Version. But Ruby is case sensitive language and now reference to
SOAP::Version gives an error "NameError: uninitialized constant".

A simple method to reproduce the error is to run test_streamhandler test.