Add makefile for building

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Use $(boot2docker shellinit) to init boot2docker.app

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Bump to version 1.3.0

Signed-off-by: Ben Firshman <ben@firshman.co.uk>