Initial play with RXCollections

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>
Conversion to ReactiveCocoa

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>
First subscription to a screen control

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>