Dinodex

Refactored dinodex to simplify usage and make it more readable/usable
Changed filter on dinodex to array instead of hash to allow filtering on same data
Removed method_missing for define_method
cleaned up dino to be less copy/pasty
Again, skip for now, but raise probably belongs in `get_mapper`, which btw should be named something without `get_`. e.g. `mapper_for(csv_file)`