* reverted to old source location retrieval for CxxConstructExpr, because source locations were outside file
* removed exisiting source location check for better performance
* fixed CXXParserTestSuite to use c++11 standard
* fixed crash on missing signature retrieval
* implemented handling lambdas as functions
* functions can have child nodes now
* NameElements in NameHierarchy can have signatures now.
* fixed crash that occurred when message listener was used while being half way through its destruction process.