Prebuilt images for Linaro

Discuss the feasibility of providing downloads of pre-built Linaro images, avoiding the
need for developers to run linaro-media-create locally. The following questions are important:

  * Who is the target audience for such a service?
  * Why can they not use linaro-media-create (either directly or via TestDrive)?
  * Is this something that we should be providing (e.g. can we QA them adequately)
  * If so, should we return to providing these rather than hardware packs?
  * If we do provide them should it be all combinations of images and hwpacks? If not, which combinations?
  * Do we need to keep the images under a certain size?
  * How should the image end up on a SD card?
  * What can be done to accommodate different sizes of SD card?