Bug: Impedance for daisy issue

Hello,

there seems to be an issue with impedance test for daisy module because this.options.daisy seems to be undefined.

[openBCICyton.js line somewhere](https://github.com/OpenBCI/OpenBCI_NodeJS_Cyton/blob/c7b49f4428a02efda73d3e22b380e135ebff201c/openBCICyton.js#L1408)

Is that only me who has this issue?

Sincerely,
Agne (@agneg)