Also prepare to support multiple stage1 flavors.
The 'host' flavor would be preferred to reuse systemd components instead
of downloading/unpacking/processing a CoreOS PXE image.
* bump stage1 base image to v794.1.0 according to upstream release
* make use of BUILDDIR environment variable to control output path
* make use of the configure option for the stage1 image path and the stage1 base image path
* fix homepage URL
* add myself to the list of maintianers
Second attempt to resolve this issue. Copies stage1 image into expected
place manually. This has been improved in rkt master where there is a
configure option for specifying the location of this file. Can update
when next stable rkt is released.
The rkt build process requires a stage1 image. By default it will try
and download one with wget from coreos.com during the build. This change
explicitly downloads the image using `fetchurl`, verifying checksum,
then passes that to the build using appropriate configure flag.
