Flex:Falcon
- Added IVariableExpressionNode API
FalconJx
- Added visitVariableExpression() to switch, ASEmitter
- Added visitFunctionObject() to switch, ASEmitter

git-svn-id: https://svn.apache.org/repos/asf/flex/falcon/trunk@1453534 13f79535-47bb-0310-9956-ffa450edef68