Initial commit of iOS client.

Only the iOS app template, no code written yet.
Add Mac stuff to gitignore.
Set deployment target to 6.0.
Add storyboard.
Set a reuseIdentifier for the table view cell.
Intermediate commit; have the storyboard, viewcontroller, and partial model.
Server: indicate 'end of output' in the 'status' command.

Add a '202' reply at the end of the output of the 'status' command,
so the client knows when it has received all of the LED information.
Server: listen on 0.0.0.0 instead of only localhost.