Don't use boot2docker ISO on disk

This was a hack for the DockerCon demo. We do want some way of
caching the boot2docker image, but this certainly isn't the way.

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Azure provider uses .pem file to authenticate

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
Merge pull request #58 from ndeloof/patch-1

Azure provider uses .pem file to authenticate
Merge pull request #53 from bfirsh/do-not-use-boot2docker-iso-on-disk

Don't use boot2docker ISO on disk
Build Windows binaries

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Merge pull request #63 from bfirsh/build-on-windows

Build Windows binaries