Adapt csv loader to maplab standart

[fabioruetz]

Hey,

Using pose csv file from the maplab node I get the following issue:

terminate called after throwing an instance of 'std::invalid_argument'
what(): stod

If I look at csv loader I can see, that csv format is not the same as in the csv loader. Deleting the 3 column in the csv file works, but its more of a hack.