Check for fswebcam

[netAction]

When fswebcam is not installed a strange error message appears.

Frame file unavailable.

[pdeschen]

@netAction thanks for reporting. I should probably check presence of fswebcam itself. Right now I'm simply looking for the video device as specified in the option hash, which is not enough for error handling.

Btw, once you get it up and running, shoot me on twitter (@pdeschen) your webcam description so I can add it to the readme know working device list.

[netAction]

The webcam of my Samsung Series 9 things it is:
/dev/v4l/by-id/usb-Namugaÿ_Webcam_SC-13HDL11624N_SN0001-video-index0

The dependency of winston can not be resolved by npm because of the new version 0.6.2.