• Support async ActiveRecord access with fibers and EventMachine (@mperham)
• string encoding support for 1.9, respecting Encoding.default_internal
• added support for rake-compiler (@tenderlove)
• bugfixes for ActiveRecord driver
  • one minor bugfix for TimeZone support
  • fix the select_rows method to return what it should according to the docs (@r-stu31)
• Mysql2::Client#fields method added - returns the array of field names from a resultset, as strings
• Sequel adapter
  • bugfix regarding sybolized field names (Eric Wong)
  • fix query logging in Sequel adapter
• Lots of nice code cleanup (@tenderlove)
  • Mysql2::Error definition moved to pure-Ruby
  • Mysql2::client#initialize definition moved to pure-Ruby
  • Mysql2::Result partially moved to pure-Ruby