Added missing multiple root support for Doctrine_Node_NestedSet::getFirstChild() and Doctrine_Node_NestedSet::getLastChild()
Added missing multiple root support for Doctrine_Node_NestedSet::getFirstChild() and
Doctrine_Node_NestedSet::getLastChild()

git-svn-id: c8c49e1140e1cd2a8fb163f3c2b0f6eec231a71d@1078 625475ce-881a-0410-a577-b389adb331d8

ascorbic/doctrine-tracker,bkw/doctrine