Fix "Could not verify the SSL certificate" errors

The error message indicates the connection failed because OpenSSL was
unable to verify the server certificate. The SSL certificates that comes
with Mac OS X 10.8 may be outdated.

http://bit.ly/ruby-ssl

This also should help avoid critical OpenSSL errors:

https://github.com/Homebrew/homebrew/commit/dc763ad98c4c5d1ce72b85e5b2ea90313fad92b2
http://arstechnica.com/security/2014/04/critical-crypto-bug-in-openssl-opens-two-thirds-of-the-web-to-eavesdropping/