adding ps,kill and readlink in busybox

The native Android kill does not seams to be working on some devices.
Instead of depending on the native binaries, we are using the busybox binaries.
added support of cdebootstrap v0.6.1

cdebootstrap v0.6.0 has a bug which is resolved in v0.6.1
add complete list of ubuntu releases to cdebootstrap

cdebootstrap is missing oneiric through utopic, this applies a patch after
unpacking cdebootstrap to add all these releases.  This patch has been
forwarded upstream:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=754228