Update/Compatibility test for OS X 10.8.2

14 March 2013
Updated/tested for compatibility with OS X 10.8.2


Major changes:

- Since version of OpenSSL bundled with OS X is not compatible with Ruby 2, it doesn't compile the extension. Fixed this and setup a workaround.
- Updated homebrew install to use SSL and to run 'brew doctor' upon completion.
- Updated the final step.
- Fixed some minor errors on Step 8d and typos/formatting throughout.
- Extract version number from $POSTGRES_VER to $POSTGRES_VER_NUM to load current postgres version on startup
- Updated MSF source checkout from svn to git/github per the following notice:

[*] Deprecation Note: After 2013-03-15 (March 15, 2013), Metasploit
[*] source checkouts will NO LONGER update over SVN, but will be using
[*] GitHub exclusively. You should either download a new Metasploit
[*] installer, or use a git clone of Metasploit Framework before
[*] then. You will also need outbound access to github.com on
[*] TCP port 9418 (git), 22 (ssh) or 443 (https), depending on the
[*] protocol used to clone Metasploit Framework (usually, git protocol).