ENH: eyetracker updates ++

1) eyelink interface now supports proper initial setup / calibration
screen. Display of eye images is also now supported.

2) Removed use of createErrorResult from all devices.

3) Update with latest ioSync device Teensy 3.0/3.1 program and
associated iohub interface changes.
ENH: iosync device

Latest ioSync code (both teensy 3 software and iohub interface code)