updated default image from 12.04 x64 to 13.04 x64
updated default image from 12.04 x64 to 13.04 x64

Ferada/tugboat,haihappen/tugboat,beni55/tugboat,noma4i/tugboat,pearkes/tugboat,noma4i/tugboat,conorsch/tugboat,Ferada/tugboat,beni55/tugboat,haihappen/tugboat,mtbottle/tugboat,petems/tugboat,conorsch/tugboat