export /std/vector</double> explicitly as the RTT exports it as "array"

Otherwise, components that define e.g. a property of type
std::vector<double> will be for instance able to access it
through corba, but won't be able to log it.
Merge pull request #1 from rock-core/fix_handling_of_vector_double

export /std/vector</double> explicitly as the RTT exports it as "array"