chore(gulp-publish): convert spawn stream to string if it's not
chore(gulp-publish): convert spawn stream to string if it's not

dennybiasiolli/ionic,alan-agius4/ionic,jarrodkoch/ionic,driftyco/ionic,manucorporat/ionic,cambronjay/ionic,jarrodkoch/ionic,AbraaoAlves/ionic,cambronjay/ionic,janglednerves/ionic,driftyco/ionic,brianespinosa/ionic2-sass,alan-agius4/ionic,janglednerves/ionic,AbraaoAlves/ionic,jarrodkoch/ionic,alan-agius4/ionic,TillaTheHun0/ionic,jhlee8804/ionic,jhlee8804/ionic,driftyco/ionic,joshesp/ionic,alan-agius4/ionic,driftyco/ionic,TillaTheHun0/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,dennybiasiolli/ionic,AbraaoAlves/ionic,manucorporat/ionic,manucorporat/ionic,jhlee8804/ionic,jhlee8804/ionic,alan-agius4/ionic,joshesp/ionic,driftyco/ionic,jhlee8804/ionic,jarrodkoch/ionic,joshesp/ionic,dennybiasiolli/ionic,janglednerves/ionic,AbraaoAlves/ionic,dennybiasiolli/ionic,manucorporat/ionic,dennybiasiolli/ionic,cambronjay/ionic,cambronjay/ionic,janglednerves/ionic,jarrodkoch/ionic,alan-agius4/ionic,TillaTheHun0/ionic,joshesp/ionic,cambronjay/ionic,manucorporat/ionic,janglednerves/ionic