Fixes rdoc link
Merge pull request #23 from strathmeyer/patch-1

Fixes rdoc link in README
Mention that passphrase callback doesn't work with GnuPG 2.0

Suggested in https://github.com/ueno/ruby-gpgme/issues/11.
Input was getting mangled when it was in UTF-8
Merge pull request #24 from Paymium/utf8-fix

Input was getting mangled when it was in UTF-8
Merge remote-tracking branch 'refs/remotes/ueno/master' into utf8-key-attrs
Use the right function.
Actually include the encoding functions.
Guards for 1.8.