MongoDB Ruby Driver v1.8.1.rc0

• Support SSL in the URI parser (RUBY-517)
• Restore timeout on ismaster (RUBY-386)
• Cleanup BSON_RUBY (RUBY-519)
• Fixes for replica set tests (RUBY-472)
• Support comments on Commands
• Added unix socket support (RUBY-342)
• Improved the create_index interface (RUBY-461)