added data structures for get seller list custom response
added get seller list custom parser
service deep refactoring
rid of getting product  info within get orders
code clean up
Merge branch 'develop'

Conflicts:
	src/EbayAccess/IEbayService.cs
added bulk job creation and bulk job abort
Merge branch 'develop'

Conflicts:
	src/EbayAccessTests.Integration/Services/EbayServiceLowLevelTest.cs