Have `make selfsigned` now call `lc-tlscert`

`make selfsigned` was pretty nifty. Even though the process is
different, maybe we should keep the target in the Makefile? I have `make
selfsigned` depend and run `lcs-tlscert`.
Merge commit '1b94da77a33ad6691d830c4db1e43be2ccb123d7' into develop (shurane PR #25)