Handbook Todo List:

  * Document adding a new IMAGE_FEATURE to the customising images section
  * Add instructions about using zaurus/openmoko emulation
  * Add component overview/block diagrams
  * Software Development intro should mention its software development for
    intended target and could be a different arch etc and thus special case.
  * Expand insane.bbclass documentation to cover tests
  * Document remaining classes (see list in ref-classes)
  * Document formfactor