init bias at zero instead of normrnd
add weight initialization choice

adds option to specify if weight should be initialized as
gaussian with zero mean and 0.01 std or as in larochelle cRBM paper
vU and vD was init as gaussan. Fix
slight help change
fix init_func error
use same name for hidden act in rbmup and rbmdown
split rbmdown in x and y part + fix bug
split rbmdown in y and x
use rbmdownx and rbmdowny