better missing helper module error messages (#244)
better missing helper module error messages (#244)

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