CSV readers

The setup for these runs is still a work in progress and there are a number of caveats that apply to the current set of results. Please don't yet cite them or take them too serious until we have sorted out all remaining benchmarking issues. The replication code for these results can be found at https://github.com/davidanthoff/csv-comparison. The raw timing data can be downloaded from here. Some more details from these runs are available here.