fix(list): removed item-left margin-left, added header border back for no lines
fix(list): removed item-left margin-left, added header border back for no lines

fixes #517

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