Merging latest minor Cocoa changes

Summary: BinaryProtocol handling of null strings, destructor, and contributors email fix. Submitted by Andrew McGeachie

Reviewed By: mcslee


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665278 13f79535-47bb-0310-9956-ffa450edef68
3 files changed