new: 128x128 icon
add: reference to new 128x icon
upd: copyright year to 2013
upd: corrected copyright year
upd: version to 1.6
new: extension package v1.6
Merge branch 'refs/heads/icon-update-retina'

erts commit 985755125498af02fd5098d1d141aca162bf4f2b.