wpool: first stable version
wpool: first stable version

added comments and specs. dialyzer is happy. still no support for arbitrary
workloads though (only mr workloads for now).
tectronics/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris,tectronics/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,seyyed/scalaris,digshock/scalaris,seyyed/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris