Creating Snappy 15.04.2 RC images:

Installing the required packages:
$ sudo add-apt-repository ppa:snappy-dev/tools-proposed
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install snappy-tools

Creating the images:

KVM/amd64 - Image 117:

$ sudo ubuntu-device-flash core 15.04 --channel edge --oem generic-amd64 --install=webdm --enable-ssh --output ubuntu-15.04-snappy-amd64-generic.img

BeagleBone Black - Image 118:

$ sudo ubuntu-device-flash core 15.04 --channel edge --oem beagleblack --install=webdm --enable-ssh --output ubuntu-15.04-snappy-armhf-bbb.img