Move arithmetic up from jspm-cli
Move arithmetic up from jspm-cli

Psvensso/builder,jrauschenbusch/builder,alexisvincent/builder,matthewbauer/builder,systemjs/builder,buddhike/builder,JeroenVinke/builder,robwormald/builder,Psvensso/builder,whitneyit/builder,Munter/builder,ahmedshuhel/builder,alexandr2110pro/builder,douglasduteil/builder,richardTowers/builder,robwormald/builder,buddhike/builder,lookfirst/builder,tonytanger/builder,jrauschenbusch/builder,alexisvincent/builder,Munter/builder,systemjs/builder,jrauschenbusch/builder,richardTowers/builder,douglasduteil/builder,lookfirst/builder,ahmedshuhel/builder,alexisvincent/builder,systemjs/builder,JeroenVinke/builder,tonytanger/builder,synaptek/builder,synaptek/builder,matthewbauer/builder,alexandr2110pro/builder,whitneyit/builder