Merge pull request #3 from thehajime/master

3 patches for integration of ns-3-dce-dnssec
remove '\\' lines
Do not run dnssec_keygen if keys already exist.
Merge branch 'master' of github.com:shored/createzones

Conflicts:
	extract_names_fromlog.sh
added ttl setting
fixed root zone to sign.
added 'issigned'
root zone now adds child zone's ds records.
add fullpath to the refered files for the execution at different directory