minor changes

[waffleboot]

• for-range on workers instead of by index
• make(slice,n) is the same as make(slice,n,n)
• worker pool config
• close(channel) as signal instead of sending boolean value
• delete isActive var and write right into active variable

[ahmetask]

it breaks backward code compatibility. We only have two variables here i think we don't need to add config.go it's simple library