make sha256 the default (instead of sha1)
make sha512 the default
move chain fetching script to tools/, now fetches SHA2-version of chain directly from DFN, removed chain file from repo, now fetching chain when accessing the first time
Merge remote-tracking branch 'origin/master' into feature/sha512

Conflicts:
	certmaker.sh
Merge pull request #25 from ZIMK/feature/sha512

Feature/sha512