jwarder

You can do it this way:
 
First do a copy to larger image, than execute those commands manually to expand to whole space:
fdisk /dev/mmcblk0 d ENTER # delete 1 ENTER # partition 1 which is the only one n ENTER # create new p ENTER # primary ENTER # default number is 1 ENTER # default start ENTER # default end w ENTER # write to disk reboot # when system gets back resize2fs /dev/mmcblk0p1