Allow "devtool add" to support adding a kernel recipe given a source tree. At least the initial implementation of this can be fairly simple - it can just copy in the template from meta-skeleton and then modify it as necessary.
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=2be37a93738a8562e2958bc57b144a73ad96fae2