Made -serialPort:didReceiveData: optional in preparation for adding reqeust response API.
Added ORSSerialRequest class initial implementation.
Issue #17: Added basic request response API. Not yet tested.
Fixed packet timeout delegate method being called even if a valid response had already been received.
Exposed port's pendingRequest property publicly (readonly).
Fixed copyright notice in header in ORSSerialRequest.h/m.
Merge branch 'master' into RequestResponse

Conflicts:
	Source/ORSSerialPort.m
Merge branch 'master' into RequestResponse

Conflicts:
	Source/ORSSerialPort.m
Better documentation for -[ORSSerialPort sendRequest:].
Updated README with information about the new request/response API.
Merge pull request #26 from armadsen/RequestResponse

Add request/response API