update version, mark version dependency for r509 in gemspec
less snarky description
proper ~> dependency. oops.
Merge branch 'master' of https://github.com/sirsean/r509-ca-http

* 'master' of https://github.com/sirsean/r509-ca-http:
Merge pull request #15 from reaperhulk/master

final 0.9 compatibility changes