add license info to gemspec to quell the warning. [ci skip]
Merge branch 'extensions-builder' of github.com:reaperhulk/r509 into extensions-builder

* 'extensions-builder' of github.com:reaperhulk/r509:
  fix and test for #41
change the default for authorityKeyIdentifier in the CRL extensions

The need for this extension is pretty questionable so it might be better
to just remove it long term. Or else make CRL extension generation
configurable...but that really amps up the complexity for users
add subjectkeyidentifier to selfsigned certs by default