Ensure Rpc Encoded soap:body has encodingStyle attribute

Addresses issue #12
There might be a better was of checking the binding style, than instanceof
Update test

Second selector seems to have issues, even though it should work
Change test to not use assertSelectCount on attribute

Have to rely on the structure, until PHPUnit works
Merge pull request #13 from rhelms/issue-12

Ensure Rpc Encoded soap:body has encodingStyle attribute