[Axis2] Implementing Service Client API

[Nabeel]

Keeping inline with the Axis2 Java Service Client API, I am implementing 
a similar client API for Axis2 C.
It has the following interfaces:
axis2_svc_client.h
axis2_op_client.h
axis2_options.h
Once this is implemented, axis2_call.h interface can be removed. (This 
will affect all the existing samples, documentations, PHP & Firefox 
extensions written on top of Axis2 C)

thanks
-Nabeel