Issue: Requests that included compex types led to invalid request XML.

Fix: Pass namespace and xmlns when generating child node XML, otherwise generated XML nodes will have no values.
Add check if namespace string contains ":".
Merge pull request #301 from ankush-garg/headerBr

Ability to add extra headers to the client request and tests
Added null check for portType and methods[methodname].output
Merge pull request #305 from gabhi/new_fix

Added null check for portType and methods[methodname].output