This fixes #2

I've implemented a splited package approach like in the kernel.bbclass for the tdt-driver modules. Now each Module gets its own package. They are all combined in a new meta-package kernel-modules-tdt.

The core-image-minimal removes all packaging data files and thus no postinst action could be executed on first boot. There I created a new image called core-image-base which is equal to the minimum with the packaging data still included.