Added implicit message forwarding on cache hits different from
BehaviorProcess'es. call messages are forwarded according to the number
of arguments. 
E.g.
x is forwarded as call/0
x: y is forwarded as call/1
x: y, z is forwarded as call/2
and so forth...

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>