CXX-175 add bulk write capabilities
CXX-175 fixups
CXX-175 ScopedWriteOperations code style
CXX-175 restore some things, add MONGO_CLIENT_API
CXX-175 rename files and things
CXX-175 check for double executed, convert wc error to soft
CXX-175 spelling and namespaces
CXX-175 move members around
CXX-175 no empty batches!
CXX-162 Configure client at initialization time via Options class
minor: style update
CXX-176 implement nToReturn

Implemented nToReturn with actual limit semantics.