Remove unused methods from ServiceRequestBase.

- ServiceRequestBase.emit() is unused.

- ServiceRequestBase.endGetEwsHttpWebResponse() is unused, but also
  incorrect: Why would one compare an HTTP status code with an enum
  ordinal?!
Remove commented call to ServiceRequestBase.endGetEwsHttpWebResponse().

Also removed a getter call without assignment and some other commented
code in SimpleServiceRequestBase that made no sense.
Merge pull request #27 from eveoh/unused-methods-in-servicerequestbase

Remove unused methods from ServiceRequestBase