Raised core revision

Ignore-this: e2c8e19c695a7bafd8338def785b32ec

darcs-hash:20130219111327-56b4d-1d902a03f90e29a3dd34d273e7e621a501acb86d
Fixed SDPAttribute.new and SDPConnection.new

Ignore-this: ed7b1ef98a9b1bb204a715183e767f4a

darcs-hash:20130219121849-56b4d-c9aa4d5b18f1e613c04f210f8d0cce4858921060