Refactored cookbook structure.

Removed ami-daq & ami-crunch cookbooks. Have been integrated into
ami-node cookbook.
Fixed minor error in nite_drivers recipe.
Added Chef Recipe for OpenCV (#91)

openCV_install is made following the indications from
http://linuxconfig.org/introduction-to-computer-vision-with-opencv-on-linux
.
Also, openCV_install_by_script is the script Mr. Vladutu previously
made.