Fix #20: On OSX 10.10 Yosemite, CardTerminal.connect throws exception.

On OSX 10.10 Yosemite, CardTerminal.connect threw JnaPCSCException(SCARD_E_INSUFFICIENT_BUFFER) because of new bugs in SCardStatus. Stop asking SCardStatus for the reader names, since I don’t even use them here anyway.
Fix #21: On OSX 10.10 Yosemite, CardTerminals.waitForChange waits forever.

As of OSX 10.10 Yosemite, the PNP notification does not notify us of a card reader that was already plugged in but the application did not know about. Do not rely on PNP notification to notify us of existing readers on OSX. I believe this introduces a race condition between listing readers and waiting for new readers, but I think this is unavoidable on Linux and OSX.