Added RetrieveOptions support for RetreiveRequest in ET_Get. Added support for delete operations to ET_Configure.

RetrieveOptions Example: http://salesforce.stackexchange.com/questions/25096/limiting-records-returned-by-exacttarget-soap-retrieverequest-object/25099#25099
RetrieveOptions docs: http://help.exacttarget.com/en/technical_library/web_service_guide/objects/retrieveoptions/

Not happy with the update=, delete= implementation, but didn't want to break existing implementations that rely on update and wanted to be minimally invasive in implementing this change in. Needed support for deleting profile attributes. 

Configure docs: http://help.exacttarget.com/en/technical_library/web_service_guide/methods/configure/
(Create, Update, Delete are only supported actions).