Fixed bug in isOpen. #1

Immediately after creating the input/output streams the status can also be "is opening". This new version is more detailed as to what is allowed to be considered "open" for the purpose of sending.
Updated project for Xcode 5
Set OSX building to 64-bit only
Renamed products to discern Mac and iOS versions
Add new initializer to directly use input and output streams.

This is particularly useful for the new iOS7/OSX10.9 NSNetService API `netService:didAcceptConnectionWithInputStream:outputStream:`.
Add delegate message for when the connection did open.
Merge pull request #3 from maxsz/master

Improve API
Merge branch 'master' into develop