Main update

Further developments of the main application.
The main patch now contains a graphical interface bpatcher containing
bpatchers of main processes (like "kinect_input", "capture_boundaries",
"data_output", etc...)
New object

js object that draws a 2D grid into a matrix.
This matrix will then be used to confine the real capture space into a
virtual xy grid  by multipling it with the kinect input matrix.
PS: there is a "spacing" attribute that allows to set empty spaces
between each hotspot(=grid's square)